Thanks, Fabulist. I'm putting down some problems I've found in that how-do-real-estate-folks-call-it bathroom, and just want to make sure that my landlord doesn't think I'm talking about the master bedroom's bathroom.
If I were talking about something that needed to be fixed, I would hope that the Landlord knew which bathroom I was talking about! For example:
"Hey Landlord person, the sink in the bathroom in the hallway needs to be fixed." I wouldn't think too hard about the term. I would also say something like "guest bathroom." A guest bathroom doesn't have to be connected to or inside the guest bedroom.