Hi! I have a question regarding the apartments. Are the three people in the building live in the building altogether, just that, they have their own respective rooms (what I mean is that, they share the same living room, bathroom, kitchen and stuffs) or they have their own rooms that you could call a small house which includes bathroom and other things and the only thing that separates them from the others are the walls? Sorry, I'm a bit confused.
Each apartment room has an different set of rooms than the next, until assigned room members the character has a normal household living space to themselves. It has a set-up just like a normal house, but in a more confined area that can have many different small "homes" side by side. By living "next" to someone it simply means that when you walk out of your front door, and looked to the side, you would see that persons door. Everyone's room is also the same shape and layout.
You may use this picture as a reference perhaps, although it's not an accurate photo since the apartments in the group are only one floor high, it should give you an idea of how they are set up.
I hope that helped, sorry for the confusion!