It could also be about a roommate with some really strange or annoying habits. For example, they might have an odd sleeping schedule and make noise when others are trying to sleep. Or they could be super stingy and not contribute to shared expenses like groceries or utilities, which can lead to a lot of conflict in the living situation.
Well, it could be about a roommate who is extremely messy. Maybe they leave their dirty dishes everywhere, clothes all over the place, and never clean up after themselves. This kind of behavior can make living together a nightmare.
Perhaps it's a story of a roommate who is very noisy. They might play loud music at all hours, have friends over constantly and be really inconsiderate of others who need peace and quiet. This can cause a great deal of stress for the other person sharing the living space.