We gave interior designers Darren Jett, Noz Nozawa, and Xavier Donnelly a photo of the same empty bedroom for a young professional—and then asked each of them to renovate it in their particular style.

And if you’re not picky about the feel, you can still flip the mattress periodically to increase its longevity. Back-pain sufferers—who, of course, should not be lifting a 125-pound queen ...