vacant room; available room
Refers to an unoccupied room in a hotel, apartment, or house that is available for use or rent.
This hotel has no vacant rooms.
I'm looking for a room to rent.
空き部屋 refers to a single empty room, often within an apartment or building, while 空き家 refers to a whole unoccupied house.
Standard spelling for a vacant room.
Less common variant; 空き部屋 is preferred.
Compound of 空き (あき, 'empty') and 部屋 (へや, 'room').