noun
studio apartment; bedsit
A small apartment where the main living area and bedroom are combined into one room, with a separate bathroom and sometimes a small kitchenette. Common in urban Japan for single occupants.
wasei-eigo (Japanese-coined English), from one room apartment
大学生のとき、駅近くのワンルームアパートに住んでいました。
When I was a university student, I lived in a studio apartment near the station.
ワンルームアパートは家賃が安いけど、キッチンが狭いことが多い。
Studio apartments have cheap rent, but the kitchen is often small.