My adult daughter and I will be in San Francisco over New Year's for a girls' trip. I'd like to burn some Marriott rewards points so am thinking either the JW Marriott or the Union Square Marriott. I've done some searches and found pros/cons for both. This is her first trip to SF and my first since I was 10 years old so we'll be doing the typical touristy things. Any suggestions as to which is better (decor, location, nearby bars/restaurants, overall ambiance) are welcome.