I too think that's the biggest problem -- doesn't matter how well you get along with the certain people, after spending too much time in the same (shared) room

I too think that's the biggest problem -- doesn't matter how well you get along with the certain people, after spending too much time in the same (shared) room with them, something (even innocent, trivial things) starts to annoy and this feeling gets stronger and stronger with time and after a while - unbearable. I shudder even thinking about spending the rest of my life sharing small apartment with the same people and no way out.