We stayed here for two nights as a family of three in June 2013 in order to "do" San Francisco. Being near Union Square it's a good location for transport and there are a good number of diners nearby as well as convenience stores.
The room we had was a decent size and very nicely decorated. The hotel staff were extremely pleasant and helpful. There's 24 hour free tea and coffee in the lobby and Wifi throughout.
We had a great time in San Francisco and the Hotel Adagio played a good a big part in that. No hesitation in recommending this great hotel.