Usually they have DS' room and he moves in with us in a travel cot. There's a double-bed in his room and an en-suite. So it converts into a nice guestroom.
We also have an attic conversion (used as an office) no bed but space for a double camping-mat/air bed. Attic also has an ensuite but just a loo, sink and bath no shower.
WIBU to start giving guests the attic instead of turfing DS out of his room? I'm tired of moving all his things out to give guests drawers and cupboard space. Also 2 sets of guests have used his cot as a luggage rack 
I don't want grubby bags and clothes dumped in his cot!!
They would be able to use his en-suite during the day, when he's not napping.