We found Bambuddha Lounge online when we searched last minute for a pre-ballet dinner reservation in the area. It's unmarked and in the beginning of a shady neighborhood, so make sure you know where it is (the staff told us that as long as we weren't "bright shiny objects that looked like crack" the people on the streets shouldn't bother us...)
When I met my friend, there were about five patrons in the whole big place. Granted it was 6pm, but it didn't fill up too much more in two hours. Friendly, but average, service.
We ordered the shrimp over papaya salad and the tuna tartare appetizers while we waited for our third to arrive. Both standard Asian fusion fare, if not a bit bland. Had a nice bottle of South African chardonnay. We shared a skirt steak and scallop entrees, of which steak was a little too flavored and scallops were good. The drunken noodle and bok choy sides were good.
Looks like there is a lounge/club scene as well, and it might be a cool space half full, but not sure I have a reason to come back. Final bill ~$45 per person.
601 Eddy Streetat (between Larkin St & Polk St), San Francisco, CA 94109