I use Viator often to book tours and airport transportation and am very happy with them here and abroad. In the instance of this Walking Tour of Nob Hill, my guide, Val, was not into walking. We started in the Fairmont Hotel, sitting on sofas, with Val handing over pictures of people and talking non-stop as if she were reciting from a tour book. We then walked to a ballroom which was not open and she didn’t have a key, so while waiting for someone to bring the key, I went to the Ladies Room which Val had a problem with. Off we went to another room, not open and she didn’t get the key to that one, and then we left, crossed the street & sat down in a park with more photos and recitations. Then we walked across the street to the church, Val handed out a diagram of the church, and said she would meet outside 15 minutes later. At this point I asked her when the “walking tour” would begin & she said we will go across the street to two more hotels and see pictures of houses. At this point I called Viator, which was hard to do. Only got a rep when I called my credit card company and the rep put Val on the phone at the same time. I was able to receive a 50% discount although it should have been a full refund. I am a person who does many reviews and this is the first negative one I have ever done. I think the problem was Val. She was doing a “walking tour” and was really too elderly to walk. She wanted to sit down a lot, which she did. The streets are hilly to be sure, but I am 70 and had I felt I couldn’t do the walking, I would not have signed up for this. Val, who obviously can’t do the walking, shouldn’t be conducting this tour. I think if someone signs up for this, when they find out who is doing it, look at the name and make sure you don’t end up in the same situation I did. $60 I thought was reasonable for a walking tour. $60 for sitting down is not.