I'd like to second what the previous reviewer said. Jonna, the owner and instructor for morning classes, is such a great teacher. She gives every student individual attention, and makes the yoga session spiritual, but not in a cheesy way at all.
I came in as a beginner, and felt very welcome. I thought it would be intimidating to do yoga with experienced classmates, but Yoga On Beacon has an atmosphere of learning and cooperation.
I moved a bit farther North, but I still make the commute down to this studio because I enjoy the classes so much.