The front-of-the-house sitting room mixes decades and attitude in a polite, polished design dialogue. Holding pride of place: a languid mid-century modern sofa by Folke Ohlsson for Dux, a find from Reeves Antiques. Flanking the sofa, graceful European chairs from Antiques and Interiors on Dunlavy (now at the Pavilion). Slate-and-chrome coffee table and a mod stool, both from Metro Retro. Cowhide rug from Heights Antiques on Yale.