5 min walk from Union Square, shopping heaven, transport hub and tourist attraction, you cannot choose a better location. The hotel is luxurious, rooms are good size and have everything you should desire. What I have to emphasize is the staff, exceptionally friendly, proactive and efficient. Practically no waiting time although the hotel is very busy. They also offer complimentary (and good quality) bicycles. They are also providing tea, lemonade, wine at happy hour, all these for free.
If you ask for something they do not have, they will get it for you. Next time in San Francisco I will definitely stay in the same hotel.