the top of the box (what you put the matress on top of) is two seperate pieces of wood which causes a shaky feeling in the matress. You can feel the two seperate pieces shift. Ideally the two pieces should be one solid piece. It seems okay for a child. My daughter is little and doesn't have enough weight to create the shift with her movement but a teenager or adult would. I would not recommend this bed for an adult or a teenager.