空房 (kòng fáng) means “available room”

More examples

周末最好早点预订，否则可能没有空房。zhōu mò zuì hǎo záo diǎn yù dìng fǒu zé kě néng méi yǒu kòng fáng

It's best to book early on weekends, or there may be no available rooms.

A room standing unused now but available for a new occupant or guest.

空房间kòng fáng jiān: An unused room in a building where someone can stay.
房间fáng jiān: An enclosed space in a building for people to use.

没有人居住或使用的房间；常指可供租住或旅馆可用的房间。méi yǒu rén jū zhù huò shǐ yòng de fáng jiān cháng zhǐ kě gōng zū zhù huò lǘ guǎn kě yòng de fáng jiān

The compound 空房 (kòngfáng, "vacant room") joins 空 (kòng, "unoccupied") and 房 (fáng, "room") to describe a room left open for use.

Its practical setting is reservation and lodging language, so it commonly appears in questions about whether a hotel can offer a room rather than in descriptions of a room's furniture.