If they did make another Juste game, I'd like to have a very heavy focus on decorating. There should be a larger room and you can get a lot of furniture. Then you can choose to have Juste decorate it for you (pre-set) or place the furniture yourself, wherever you want to. Of course, Juste's tastes are sublime, so the pre-set function would be superior. The furniture should exceed 100 original items or so, so that there is no shortage of variety in decoration. Oh also, you can interact with the furniture and invite friends to your room.
I'm not sure how the rest of the game should be like. Maybe a quest to get as many furniture as you can, because the whole "hunt Dracula" thing would be redundant at this point.