If you are talking about the Kura bed that can either be on the floor or up higher like a loft bed, DD's had hers for over 2 years (we put it together for her 3rd birthday) and we just put a regular twin size mattress on it. We've never had any problems with it (although it can be a bit of a pain to put new sheets on it.
As for the decoration part: We took chalkboard spray paint and painted the blue sides of the panels with it. Then when we put it together, we made sure the spray painted sides are out, and now she can color all over it with chalk. She loves it. (If you do this, I HIGHLY suggest you spray them AT LEAST 5 days before you put it together. We only gave it a day or two, and of course she wanted to color on it immediately; it scraped some of the paint off)
at 10:15 AM on Jul. 29, 2010