The XYZ Bar/Lounge at The W Hotel is very very chill. It's a small, laidback lounge that has good drinks. There's no cover to get in and you can just order a drink, then sit at one of their comfy sofas. It's a bit upscale because it is in the W, but I totally recommend coming here to wind down. It seems like a good place to meet people if you are single and available.