Luxurious, sensual, and subterranean, this salon-like lounge features antique couches purchased from flea markets and a fetching vivid red interior with mood lighting. 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. A large majority of Madame X's crowd consists of hip, young professionals with distinct Soho attitudes. Nonetheless, drop in for the impeccable vibe and guaranteed good time.