There iIt has a balcony attached to the bedroom. It has a balcony attached to the bedroom.

Apartments usually have more than one room, and since you haven't mentioned if it's just a one room apartment, you'll need to mention a particular room. Also... narration-wise, you can add a bit more detail about the balcony, like "a balcony with a great view", or "a 3-ft wide balcony", since just mentioning the balcony for the sake of it seems awkward.

Two years have passed since I moved here. Two years have passed since I moved here.

I like this roomplace, but yesterday, an annoying person seemeds to bhave moved to my next-door room. I like this place, but yesterday, an annoying person seems to have moved next-door.

The neighbor's alarm went off at 2 a.m. and continued sounding until 4 a.m. aAnd what i's worse, is the person often hity often kept hitting the wall. The neighbor's alarm went off at 2 a.m. and continued sounding until 4. And what's worse is they often kept hitting the wall.

Again, the alarm went off at 2 a.m. I got so angry that I went out and knocked the door of the neighbon my neighbor's door. Again, the alarm went off at 2 a.m. I got so angry that I went out and knocked on my neighbor's door.

No one replied. No one replied.

You could also say, "Nobody replied" or "No reply".

I camewent back in my room and hit the wall with anin rager. I went back in my room and hit the wall in rage.

Then, the neighbor hit back the wall muchback even harder. Then, the neighbor hit the wall back even harder.

I got furious, so I kicked the wall, yet the neighbor didn't stop hitting back. I got furious, so I kicked the wall, yet the neighbor didn't stop hitting back.

It's a bit unclear what "it" here is, is it about just hitting once often? Or is it about hitting back every time the protagonist hit the wall?

I gave up and listened to the music with my headphones on. I gave up and listened to music with my headphones on.

Morning has comes. Morning comes.

I called the real estate management company on the phone and complained about the neighbor. I called the real estate management company on the phone and complained about the neighbor.

"On the phone" is unnecessary here.

Then, he said wonderinglyin confusion, Then, he said in confusion,

If you meant to say 不思議そうに, then this is right. Wonderingly, I think, is used to mean 魅了されて.

"IThat's strange because n. No one lives in that roomapartment. "That's strange. No one lives in that apartment.

We don't have any contract with anyones for that roomone. We don't have any contracts for that one.

Maybe you've mistakenook it for what the resident on the floor below you did? Maybe you mistook it for what the resident on the floor below you did?

"Impossible! I shouted, "Impossible! I shouted,

This sounds more natural.

Absolutely someone isSomeone is definitely in the next room! Someone is definitely in the next room!

Then, the staff then said, The staff then said,

Just making it sound a bit more natural.

"Okay, I goet it. "Okay, I get it.

I'll check through security cameras to see if someone tresspassed into the roomplace. I'll check through security cameras to see if someone trespassed into the place.

I was lookinged forward to ahis call from him., I looked forward to his call,

I got aAnd he called this evening., saying, And he called this evening, saying,

"We've checked outthe footage and found no one broke into the room. "We've checked the footage and found no one broke into the room.

Using just "checked out" would by like using the idiomatic phrase, which means leaving a hotel after staying.

Also, we actually entered the room actuallyapartment today, but we couldn't find anything like an alarm watchclock or a mobile phone" Also, we actually entered the apartment today, but we couldn't find anything like an alarm clock or a mobile phone"

I thought they cut corners at their investigation. I thought they cut corners at their investigation.

Not sure what you meant here, but TLing cutting corners in investigation directly would be, "行き届いていない調査をした” or ”雑な調査”. It would mean that they did at least 80% of the work, but didn't do the rest of it properly. But from the sounds of it, it looks like they didn't perform the investigation at all, since they searched an empty apartment and didn't find anything.

I'll get any evidence by myself!! I'll get evidence myself!

I bound a mirror on the stick fora selfie-stick. I bound a mirror on a selfie-stick.

When the alarm started, I went out to the balcony and sawfound the room lights on. When the alarm started, I went out to the balcony and found the room lights on.

As I expected, someone should beit meant someone was there! As I expected, it meant someone was there!

I stretched my arm with the stick and looked into the room through the mirror and, but found no one was there. I stretched my arm with the stick and looked into the room through the mirror, but found no one.

I also found tThe window was unlocked. The window was unlocked.

Probably, the management company's staff forgot to locking it and turning offleft the lights on, too. Probably, the management company's staff forgot to lock it and left the lights on, too.

I put my phone into a the pocket onf my jeans to take photos of evidence. I put my phone in the pocket of my jeans to take photos of evidence.

I bound thetied one end of thea rope on the fence of my balcony and bound the other end on myself. I tied one end of a rope on the fence of my balcony and the other end on myself.

I jumped ionto the balcony of the next room. I jumped onto the balcony of the next room.

I entered the roomapartment and hunted all over the room for the alarm, but I couldn't find it. I entered the apartment and hunted all over the room for the alarm, but couldn't find it.

When I looked back to the window where I entered, I wasbecame aware of how the outside was different from the onewhat I always seeaw. When I looked back to the window where I entered, I became aware of how the outside was different from what I always saw.

I went out to the balcony and saw the darkness, all overenveloping the outside. I went out to the balcony and saw the darkness, enveloping the outside.

There should've been some buildings in front of ourthe apartment, but there was nothing is there now. There should've been some buildings in front of the apartment, but there was nothing there now.

I caouldn't see anything but darkness. I couldn't see anything but darkness.

You can switch tenses in Japanese during narration, but we keep it all in the same tense in English.

I turned towards my room but it had disappeared and left the darknesstoo. I turned towards my room but it had disappeared too.

I turned to the otherpposite side. I turned to the opposite side.

It' was the same. It was the same.

Even thoughwhen I lookinged up and down, I just learned it's was just darkness. Even when I looked up and down, I learned it was just darkness.

I wentheaded to the entrance door and opened the door. I headed to the entrance and opened the door.

The corridors had disappeared and became darturned black. The corridors had disappeared and turned black.

Just writing "dark" here would make it seem that the corridors had dimmed in brightness. Black would be a better word here.

LIt looksed like I'm was in a room floating in an endless outer spacevoid. It looked like I was in a room floating in an endless void.

The rope from my balcony had disappeared. The rope from my balcony had disappeared.

I caouldn't go back to my room, to the real world. I couldn't go back to my room, to the real world.

I took out my phone and tried to calling someone, but couldn't. I took out my phone and tried calling someone, but couldn't.

I haveThere was no signal. There was no signal.

I was at a loss for what to do and so, seated myself on the floor. I was at a loss for what to do and so, seated myself on the floor.

Suddenly, the alarm of my phone soundedrang. Suddenly, the alarm of my phone rang.

It's sSix o'clock. Six o'clock.

I usually geot up around this time. I usually got up around this time.

Tears coame out in despair. Tears came out in despair.

Why had I caome here for such a trivial thing? Why had I come here for such a trivial thing?

I should've ignored it and moved to another room. I should've ignored it and moved to another room.

Is "room" here just 部屋 or アパート?

The alarm waskept sounding continuously. The alarm kept sounding continuously.

RescueHelp me! Help me!

Rescue me, sounds like you are ordering someone.

I hit the wall harder, and then,... the person hit back much harder. I hit the wall harder, and then... the person hit back much harder.

RescueHelp me!! Help me!!

I continued hitting the wall, but the persony stopped hitting back. I continued hitting the wall, but they stopped hitting back.

Please rescue me!! Please rescue me!!

This is okay since you are using please.