My dream is to stay in a guest room attached to an open air bath with the idol I love.
In this hotel, all the guest rooms have concierge service.
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.