Ritz service but dated property
The Hotel: As with most of SF there is limited space and although Ritz Carlton does a good job with the lobby and other areas, it just feels it needs a renovation. I may be biased beacuse I usually dont stay in SF and not used to the small size hotels. The service is typical Ritz and I say that in a good way. My one complaint would be the doormen didnt make me feel invited and seem to spend most of their time with someone who may give them a large tip. 
The Room: Small.....They do the best they can with the space they have but as mentioned before a renovation is in order and I fully understand the cost and logistics to keep the hotel open during renovation is a nightmare. We just returned from Rosewood Hotel Georgia in Vancouver and they also have limited space but Ritz should use them as an example. 
Fitness: No pool and there is a large area for yoga and stretching but again the same theme of being small with limited equipement. 
Spa: Didnt use it but the area always smells nice and the staff working the area was very nice. Tea and coffee is available near the spa.
Restaurant: We ate there twice for breakfast and it was very good. Our waiter on the first day was very nice and catered to our daughter and our friends kids very well. My wife had the buffett and she liked it but maybe a bit overpriced but the quality was definetely good. The kids french toast covered with cereal was a hit with the kids. 
The second day breakfst was a Tuesday and our waited looked like he was in training. Not as a fun an experience as the first( i wish I could remember his name to give him credit). 
Location: Good and correct from other reviews of being close to Chinatown and Union Square. Just a 5 min walk to either place. The trolley also around the corner from the hotel. Didnt have a car so cant comment on parking but Im sure it is very difficult.