I passed a very pleasant week at Retta and Eric's flat. The flat is in a very quiet residential area. The terrace on the canyon is superb: having my coffee there in the morning was a real pleasure. The room in small but, given the outside space, you can comfortably stay even in two. Eric and Retta have been very welcoming and helpful.
I went to San Diego for a conference. The conference location was at about 20 minutes by bike or scooter from the flat both easily found as free-floating services. Balboa Park is at walking distance. I definitely advice Retta and Eric's if you dont mind to stay a bit out from the city center.