I've been playing for a couple of weeks and the only furniture in my house is a plant, a ? block and a single red bed, all laid out Feng Shui stylee. Trying to hold off on working on the rooms properly until I get decent furniture/wallpaper/carpets though.
I was thinking bedroom on 1st floor, 'Nintendo' room in basement. Then living room, kitchen, maybe a bathroom and another room I can't think of on ground floor.