In the living room, painted Benjamin Moore’s Decorator White, a pair of curved sofas upholstered in a crisp Larsen material face each other across a vintage coffee table discovered in Barcelona. Beneath the Sole Shades window treatments are a pair of consoles—one the clients already owned; the other Sefferovich had fabricated to match. African Juju hats and a pair of brass trays make a striking statement above the fireplace.