Noun
きゃくしつ
大すきなアイドルと、ろ天ぶろ付の客室にとまることがゆめなんです。
My dream is to stay in a guest room attached to an open air bath with the idol I love.
このホテルでは全ての客室にコンシェルジュサービスが付いてきます。
In this hotel, all the guest rooms have concierge service.
ちょうど客室のリフォームが終わったところなんですの。是非うちにいらして、ご意見を聞かせてくださいな。
I just finished renovating the guest room. Come over and tell me what you think.
A guest's room is the guest room (the room you put guests in, duh!).
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.