jednosoban

1. (of an apartment) one-room
   Iznajmljujem jednosoban stan na Vračaru. — I'm renting out a one-room flat in Vračar.
   Žive u jednosobnom stanu sa dvoje dece. — They live in a one-room flat with two kids.

Listings also use jednoiposoban (one-and-a-half rooms) and garsonjera, a studio. Serbian counts living rooms as well as bedrooms: a jednosoban stan has a single room plus kitchen and bathroom. An English one-bedroom flat usually corresponds to dvosoban, though listings may classify it as jednoiposoban depending on the layout and room sizes.