Against a backdrop of honey-colored paneling and wide-plank floors, John and his lead designer, Mitchell Kulkin, filled the 90-year-old house with patterned rugs, tons of artwork, and cool lighting fixtures, like the carved flower pendants by Romanian sculptor Lazslo Tompa that illuminate the upstairs hallway. The “batwing” desk, by Michael Gregorio of Modern on the Hudson, is one of John’s favorite pieces.