We adored our stay here. The location is fantastic and the staff were wonderfully helpful and friendly. The sherry/tea hour in the lovely lobby every evening was a really nice way to meet people from all over. We had interesting conversations nearly every evening with people from all kinds of places, plus a couple of nights there was a pianist. It instantly became an enjoyable, end-of-day/before-dinner ritual for us.
Back to location, it's just off Union Square, and we were lulled to sleep by the music of a particular busker that floated up to our window every evening. Farallon, one of the city's best restaurants is right next door, and there's a theatre in the building.
Our room was extremely comfortable. The linens were particularly glorious. (We were very happy about the fact that there was an in-room recycling bin.) The bath was small but well-appointed. It could have used an empty shelf for the guests' personal items, but that's a small matter.
All in all, we enjoyed our stay immensely and would definitely visit again.