We stayed for 8 nights while I was there for a conference and some holiday. The apartment looked just like the photos and the bed was very comfortable. It seemed generously sized - although it says queen in the advert I think it's a king by UK standards.
The roads do have parking restrictions, which was a pain, but Amanda was very helpful with arranging for us to park our small car in front of the garage to avoid getting into trouble.
Well equipped small kitchen allowed us to have a couple of evening meals in. Very clean flat. Good shower pressure.
You do hear the movements of Amanda's family above you occasionally but it wasn't an issue for us as we were out a lot of the time, and tended to sleep through it in the morning!
We would definitely stay here again. Valencia street has amazing restaurants and we felt we had a better SF experience than if we were in the centre of town in a hotel.