A great property which is always a pleasure to return to.
The Steinhardt is very reasonably priced, immaculate, quiet, safe, and lovely. The building is an old apartment building of grand proportions and all the rooms are suites. The architectural details are lovely, everything works, and the front desk is savvy and service-oriented. They are true professionals, anticipating your needs.
Some of my friends object to the location because there is a slightly scuzzy block a short walk from Union Square. However, if you stay on Sutter and look like you know where you are going, there is no problem. There are hotels and restaurants along the way, so the streets are usually populated with people. I have never had a problem, and security is superb. 
This is a unique place with lots of substance and style, and it is the only place i stay in San Francisco. The conference at which I was speaking was at the Hyatt, and I chose to stay here and walk the half hour to and from each day. Love it.