Is the house still there? If so, what does it look like? I realized that I didn't know where 4135 19th Street in San Francisco was located. So I used Google Maps to find the neighborhood and saw:
The house at 4131 19th Street is the light blue house just to the right of the beige/brown house on the left. It is a two-story house, with a garage and entry built in front of the older two-story structure.