Ok, the girls' apartment is 8 people in one room (bathroom is independent), Henry's apartment (girls) has 4 people (bathroom is independent), rooftop apartment (boys) has 4 people (bathroom is independent), followed by girls' dormitory (just general) with 8 people. The toilet is a dormitory for ordinary boys, with 8 people. I don't know the name of the apartment that was built behind the laboratory, but I'm pretty sure it's the house in the school.