Converted our spare room with a foldy desk bed thing.
It was a double bed that just about fitted in the room and was only really useful to pile junk in, an occasional guest required a big tidy up.
It’s now a home office with built in shelving unit and desk, which folds down for guests.
It was meant to be a cantilevered desk but it doesn’t get folded down often enough to be worth it so we just clear the desk each time, however the bed is frikken heavy which is the only downside.
The only silly thing is we rarely work from home now so it just gets used for the odd stint of route planning and one day a week for work!