noun
A room in a house, hotel, or facility set aside for guests. Common in both private homes and hospitality contexts.
ホテルのゲストルームはとても広かった。
The hotel's guest room was very spacious.
家にゲストルームがあるので、友達が泊まりに来ても大
We have a guest room at home, so it's fine when friends come to stay.