expression
vacant rooms available; rooms available
Set phrase used in accommodation contexts to indicate that rooms are available. Often seen on signs, websites, or in spoken announcements.
ホテルの看板に「空室あり」と書いてあった。
The hotel sign said 'Vacant rooms available'.
今週末はまだ空室ありです。
There are still rooms available this weekend.
Compound of 空室 (vacant room) and あり (exists). A straightforward set phrase used in the hospitality industry.