Linda Gottlieb’s bathroom, with its soft-plum Venetian-plaster walls by Orazio De Gennaro Studio, makes for a sanctuary-like space off the master suite she shares with husband Robert Tessler—who credits their marriage’s success to the one bed, two bath approach. Taking advantage of the room’s natural light, designer Lichten Craig outfitted the window with lightweight fabric curtains and installed a mirrored bath and cabinets.