The better providers I could recommend all book in advance and/or do reference checks for hobbyists they've never seen.  Both Natasha & Porscha are two of the best the area has to offer and you can find either one by typing in their name under reviews and highlight San Francisco.  If you're going to be booking under tight notice, you might consider one of the many AMP's in the area.  I would recommend Liana or Catt (at the same location) in Mt. View - see my review of Liana for the phone number.  Also, both Mimi and Lexy get great reviews - haven't seen either.  You can find contact info by logging onto eros San Francisco escorts.  Feel free to PM me if you have any questions.

How much do you want to spend and what type of girl do you like--age, ethnicity, body-type, service type, etc??