guest room
From Longman Dictionary of Contemporary Englishguest roomˈguest room noun [countable] a bedroom for a visitor or visitors to use SYN spare roomExamples from the Corpusguest room• One night, hours after Roland and Mimi had gone to bed, Margarett appeared in the garden outside the guest room.• The guest room that he had was large and airy, and overlooked a different part of the garden from Jessica's.• We removed our gear from our bikes and were ushered into their guest room.