我是越南的学生一个学生，来自(or 我住在)越南。

I don't know... It just seems better? Maybe also: 我是一个住在越南的学生, but that's clunky)

今年我18岁，身高一米七高。

我不是每天做运动，但是我很喜欢做运动。

我最喜欢在家跑步和，跟朋友和踢足球。

How I interpreted the sentence was: I really like (or I like the most) running at home and playing soccer with my friends

左边那一个房间是我妈妈和我爸爸的。

左边那个房间是我妈妈和我爸爸的 sounds good when you're giving a tour of your house, and you're pointing at the room.

他们有(一)个很大的房间。

我的房间也很大。

右边的桌子上在一个有一台电脑，和右边在一个也有一张床。