Luxurious, sensual and subterranean, this salon-like lounge features antique couches purchased from flea markets, as well as a fetching red interior. The front bar, decorated with old-fashioned headboards, is small but opens into a larger back room. There is an upstairs space as well. Overall, the cocktails are smooth and the staff is friendly. The majority of Madame X's crowd consists of hip, young professionals with distinct Soho attitudes.