We love this twin sofa bed!  It was so easy to put together and only took about ten minutes.  There are four legs to screw in the bottom corners and a couple of center piece brackets to screw in on the bottom as well.  The back of the sofa tilts forward then backwards until it is flat.  It is very sturdy and pretty comfortable!  Because of how the bottom brackets line up the seams are a little off, but it works like it should and still looks good.  I highly recommend if you need a piece of furniture that you can use as an extra sleeping space!