Generally, there "has" to be at least one room that is for the exclusive use of the renter. That would be the bedroom. So at an absolute minimum that room is for the sole and exclusive use of the renter. If a two bath house where there is a bath that can only be accessed from that bedroom, then that bath is also for the exclusive use of the renter. So I'm not seeing how you can't have a clearly demarcated area for the renter, unless there's something about this arrangement you're leaving out.
