About a year ago I visited a Provider who was visiting from out of town and hosting incall in her hotel room. It was at the Beacon Grand hotel in Union Square. The vibe it gave off was a first class hotel. In the room the furnishings were comfortable and luxurious with the room being spacious.

There are a number of places in the Union Square area and what I like about Union Square is it's pretty easy to find parking within reasonable walking distance of a variety of hotels.   Most might/will require a keycard to use the elevator.

The SFO area (just south of the SFO airport) is cool, because they tend to be busy, so it's easy to "blend in".  Also, parking is plentiful as well.