Is this a bad idea or fine? We're making ours into a bit of a play/craft room with sofa off the dining room and was wanting to make it look really funky with maybe orla keily wallpaper on one wall. It has UFH and a glass roof, but still gets much colder than the rest of the house, especially at night. I'm not bothered about fading as I enjoy redecorating every few years anyway but DH thinks it will get damp and ruined quickly-is he right??