Location, location, location
The Chancellor may be the best bargain not only in San Francisco-- but in any major U.S. city. We love it for its great Union Square location as well as its amenities. Wes the GM and his excellent staff provide all the creature comforts without being on top of you. It's the little things like free cookies, coffee, fruit and water-- always stocked in the lobby. 
The rooms are very comfortable and always incredibly clean. The bathroom products are all top notch-- and the bed makes for a great night's sleep.
If you are looking for a hotel with character and charm-- this is the place.