Assembly took 90 minutes, but all parts were there, nothing broken or damaged.  No special tools, they way a hammer and screwdriver, but never needed the screwdriver, and the hammer was not essential.  Very satisfied with the appearance.  The mattress rests on top of the wood support slats, not fitted into a slot, so it could slide a bit.  Using an 8inch memory foam mattress, I would probably go thicker for someone bigger than 125 LBs.