Cool concept! I personally needed an ottoman more so than a bed, but I love that I now have the option of both wrapped in one piece of furniture. The side curtains have magnets on bottom corners so they can adhere well once you have the desired look, whether it be an ottoman or bed. As for firmness, the ottoman cushain is firm so Im certain this will help maintain its shape. As a bed, this is also firm, almost to the point of too firm. Id recommend adding a twin-sized 3 memory foam topper for added comfort. Yes, this would be an additional expense however, this will help provide more comfort to overnight guests.  Good quality, easy to change to desired look.