Part of the Sivananda yoga following http://www.sivananda.org/
I first went there because they offered periodic free open houses on Saturdays, with free open classes, lectures, and meditations. I liked the tone of the place so much that I bought a 10-class card. There is a huge difference between going to a spritual, genuine yoga center, and just taking a yoga class at your gym.
It occupies all floors of a town house, with a couple of floor-through practice rooms that allow gentle cross-breezes. There are a wide range of classes and activities. There is a kitchen downstairs where members prepared yummy vegetarian meals you can eat in the back garden. A small shop offers mats, books, other pieces of equipment, and raw-food baked goods from the kitchen.
My one complaint would be that there is not enough changing space - come dressed.
I liked the tone of this place so much that one spring I visited one of their ashrams - this one on Paradise Island. Also lovely, but that's another review....! http://www.my-yoga.net/