My Mother-in-law's 50th birthday is coming up. She wants to go somewhere fancy and intimate and quiet (in SF). Not coat required fancy though. Most of the nice restaurants I know are already booked for a Sat. night that is not too far away (end of April). I think she cares as much about ambience as she does about food. Price is not really an issue. I'm open to any type of cuisine as well. Oh, and there are only six of us. Any ideas?