Translation:An apartment has at least a floor, a ceiling and four walls.
Ah, that reminds me of garsonieră which is used to describe a small apartment, although the specifications for such a dwelling seem to vary according to dexonline:
- apartment comprised of a single room, a bathroom and sometimes a kitchen
- small apartment, comprised of one or at most two rooms and a bathroom, usually without a kitchen
- dwelling usually made up of a room and a small kitchen
I think in some of these situations there is a communal kitchen shared by several families living on the same floor.