Vingt-Quatre

This 24-hour café and diner in Chelsea has long catered to the most elegant post-2am party crowd in town. People don't come for the food, although there's nothing wrong with it, but they come because it's a laid back yet stylish place to keep the night going. Get a Beef Chilli Dog to soak up the booze, or more booze if you're not ready for that - indeed you can go full circle and order an all-day breakfast before bed. They've recently opened up a second branch in Bloomsbury (Great Russell Street) with the same diner style interiors but more space. Though be aware, both venues hike up the prices for the night shift and impose a nominal cover charge after midnight.