We stayed a night at the W for my birthday. The check in process was very quick and efficient. The hotel sent champagne and a card for my birthday which was nice. The bartender at the Living Room was also very helpful and friendly as well.
The location is very good as it is walkable to the Moscone Center and Union Square. We also walked to Embarcadero, but that is a little further.
The room was comfortable but very small for the price. Further, the furniture and bathroom decor should be updated.