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.

The space under a loft bed can be used as a study area with a desk and shelves, or include wardrobe space or other cupboards,' explains interior designer Ursula Wesselingh. That's exactly what ...