I would just add that as you are flying to SFO it is extremely likely you will indeed be out of the B gates (4 out of our last 6 to USA). I prefer the “A” F lounge and so we recently stayed in an executive room at DIH but asked for A concourse anyway. The meet and greet was fantastic and having a place to relax and sleep was spectacular. AWESOME massage chairs in the executive rooms. Overall much better than leaving the airport if you have 8-10 hours. FWIW the entrance to the “B” F lounge is still under construction and so you have to walk down quite a way to enter. Don’t forget you can email the spa also and prearrange your free treatments in advance at the times you desire.