We have a spare queen mattress and boxspring that DS has been sleeping on for the past couple of weeks. It's bigger than what we wanted for him (we would have gotten a full) but I hate to pass up free. We are looking at a Hemnes queen bed but I can't tell how high the mattress will sit on it. Right now he's about 19 inches off the ground - would anyone know how high the mattress only would sit on the Hemnes slats? The website says the bedsides are adjustable but I'm not sure if that means you can raise and lower it like you can with DD's PBK bed or something else entirely. If it's a lot higher we are going to just keep him on the mattress and boxspring but I really want to complete his room for him!

Thanks so much!