Bringing to mind youthful memories of the days when the best parties were held in the basement, Underbar is a cozy lair that sets the scene for sophisticated after-work cocktails or second-date seduction. The candle-bearing sconces on the walls and minimalist decor ensure that loungers are seen in a flattering light. Go early in the week to feel in-the-know. The weekend crowds detract from this hideaway's best-kept-secret vibe.The DrawBlack-clad 30-something locals and business trippers mix over decadent (and decadently priced) cocktails such as the Raspberry Sunrise. The plush velvet couch arrangements make for a sexy setting, but the curtain-enclosed cubbies lining the lounge's periphery are clearly the sweetest seats. Perfect for conversation and canoodling, these nifty nooks sport the best service. Pull the cord inside, and a waitress appears--a touch of luxury that helps take the sting out of your steep bar tab.