It was a difficult choice for us wether to stay in Union square or fishermans wharf. After chosing to stay in Union square, we did find that we were almost daily having to make the journey to the coast as that's where most of the tourist things are. However, if you can get on, the cable car stops pretty much right outside the hotel, which is an enjoyable way to get around, and also the tourist buses stop only a block away. To walk to the wharf was only 20 mins and ok for us as we are in our 20s, but if I had brought my mother she may have struggled due to all the hills.
The only other thing regarding booking the hotel, was the hidden costs at the end. I assume Americans will be used to taxes being added on to the price you see online, but we we are from the UK we are used to seeing the price we pay online as the final price. At the end, San Francisco tax, and California tax were added, along with some other fees and wifi fees. This would have happened at any hotel we booked, as we expected the taxes to be included in the price per night we booked online. Next time we would consider this into the budget so there are no nasty surprises.
The location of the hotel was fantastic, only one block away from Union Square. The maid was brilliant, always a nice clean room to return to after a day out. The concierge was lovely and really helpful giving advice of things to do in the local area. We didn't eat at the hotel on this trip, although the restaurant and bar areas looked very nice.