Super hotel in a so-so location
The Hilton SF Union Square is a remarkably active hotel with business people, conference attendees, and tourists. This can make it a bit daunting at times. However, service, particularly if you are a Hilton Honors member which makes it easier to check-in/out as well as to get a better room, is strong. It is easy to walk from the Hilton SF Union Square to Union Square, the Civic Center, the Embarcadero (20-30 minutes), Moscone Center, and many other locations. The problem with the area is at night when one does have to be concerned about their safety or the (un)pleasantness of their surroundings. My room was quite nice and had a number of pleasant amenities that seem to be standard for Hiltons around the world or perhaps for Hilton Honors rooms. The Urban Tavern restaurant in the hotel was pleasant for lunch, though a bit pricey as SF hotel restaurants can be.