Very Comfortable
As we were traveling by shuttle from the airport to our hotel we went through some pretty seedy looking areas. We then entered a very nice part of the city and my first thought was "I hope our hotel is in this area" and it was! It is the perfect location-the cable car route is right in front of the hotel, the Sears Restaurant is next door, Starbucks across the street, fabulous shopping all around, Union Square. 
The room was of sufficient size and nicely decorated. We laughed when we opened the curtains as we had a "view" of some duct work on the roof and the side of another building. But that was fine. The room was pleasant and quiet. We were there only to shower and sleep.
The hotel staff was very accommodating and helpful. There is delicious coffee and ice water with lemon in a pretty glass container, both available 24/7, as are cookies and fruit. They offer late checkout, which worked out great for us and our flight schedules.
My friend made reservations through the hotel for a massage at a nearby spa. She said the spa was beautiful and it was a great massage. The price is reasonable also.
I would definitely stay at the Chancellor again if I ever get back to San Francisco!