King size mattress appears small on this bed. I seriously doubt the dimensions and alignment of side rails.
Major reason for  giving 2 stars is the delivery is very very bad. Headboard got damaged with big puncture on top of the box. The worst thing is that Fedex guys has left it downstairs(opposite another apartment unit's front door). The whole point of choosing delivery to the front door did not work. That is so heavy and a single person cannot carry to upstairs. It is a very big lapse on Delivery instructions by Wayfair.