Wide-ranging pieces by prominent voices of the past—among them Ettore Sottsass, Arne Jacobsen, Maria Pergay, Harvey Probber, and Gabriella Crespi—now mingle with an array of present-day treasures, like the dining room’s Frida Fjellman chandelier or the living room’s bespoke sofa. Contemporary art, much of it purchased together during jaunts to galleries or trips to art fairs, adds its own dynamic layer.