Number/Demonstrative + 间 + Noun
The classifier 间 (jiān) is a measure word used for rooms, houses, and enclosed spaces. It is placed between a number or demonstrative and a noun referring to a room or building. For example, 一间公寓 means 'one apartment' and 这间房 means 'this room.'
这间卧室朝南,阳光很好。
Zhè jiān wòshì cháo nán, yángguāng hěn hǎo.
This bedroom faces south and gets great sunlight.
酒店只剩下最后一间房了。
Jiǔdiàn zhǐ shèng xià zuìhòu yī jiān fáng le.
The hotel only has one last room left.
我们需要再找一间会议室开会。
Wǒmen xūyào zài zhǎo yī jiān huìyìshì kāihuì.
We need to find another meeting room for the meeting.