My trip in Rometo Italy

Seems like you went to multiple cities, so I replaced Rome with Italy.

This summer I gonewent with my girlfriend (currently EX-girlfriend lol) into Italy.

First of all, we flew from Marseille to Rome to visit the city as well as to eat pizzas, glacesice cream and pastas.

Is glace a specific type of ice-cream in Italy? If not, put ice cream there.
I removed the plural from the listed words, I've never seen these specific ones written with an s at the end.

Then we got ion a night bus to Bologna.

Usually we get into cars, but onto buses, airplanes boats etc.

And the following day we gonewent to Venice to paradewalk around this beautiful city.

"parade around" gives off a sense of pridefulness or sometimes arrogance.

Just saying "walk around" or "walk through" makes more sense.

The thing I will always keep in mindremember is our walk intos through all the little streets of Venice.

"always keep in mind" is more for remembering a task or a warning. It's also feels formal, something someone would tell you at work or that you'd read in a document.

There wasere many beautiful buildings, and shops and the fact. The most beautiful thing was that thise city seemsed like an isle because of all the water is the most beautiful thingand, surrounded by the sea.

"Island" is more commonly used than "isle".

Slightly reworded it. I seemed like you were trying to create an image, so I made it more concise.

You could probably reword this is multiple ways.

We verreally liked our trip, particulary me andespecially me. I really want to go into Italy again next summer.

This summer I gonewent with my girlfriend (currently EX-girlfriend lol) in Italy.

It was more my choice than her's.

First of all, we flew from Marseille to Rome to visit the city as well as eat pizzas, glaces and pastas.

And the following day we gonewent to Venice to parade around this beautiful city.

“the beautiful city” sounds more natural since the city is specified as Venice

The thing I will always [keep in mind/remember] is our walk into all the little streets of Venice.

There wasere many beautiful buildings, and shops and t. The fact that this city seems like an isle because of all the water is the most beautiful thing.

Island is more common than isle

We very liked our trip very much, particularly me and I really want to go into Italy again next summer.

My tTrip into Rome.

You go on a trip TO somewhere.

This summer I gonewent with my girlfriend (currently EX-girlfriend lol) into Italy.

Past tense is "went". "gone" is past participle and would be used in say the perfect tense. However, perfect tense would be incorrect here.

It was more my choice than her's.

No ' in hers.

First of all we flew from Marseille to Rome to visit the city as well as to eat pizzas, glaceice creams and pastas.

We don't use glaces in English. You might say gelato or gelatos instead of ice cream as you are in Italy and we do sometimes use the word gelato. You would not make pasta plural in this case.

Then we got in a night bus to Bologna.

And the following day we gonewent to Venice to paradestroll around this beautiful city.

"parade" doesn't really work here. It has a bit of a sense of showing off as opposed to simply walking.

The thing I will always keep in mindremember is our walk intoamong all the little streets of Venice.

"keep in mind" is more an instruction to remember something rather than simply remembering it.

There wasere many beautiful buildings, and shops, and the fact that this city seems like an isleand because of all the water is the most beautiful thing.

"were" plural form. "island" would be much more likely than "isle". In theory you could say isle but it is a bit more poetic / archaic sounding.

We very liked our trip, particularly me, and I really want to go into Italy again next summer.