Really clean, cozy place. Appliances all work really well, Internet is really fast. As others have mentioned, the neighborhood is not in the nicest part of San Diego and is not the most inviting for a night stroll, but I never felt like I was in any danger. Also the location is roughly a 10 minute drive from downtown, Balboa Park, Coronado, North Park and other popular spots so in that sense the location is really great. It is close to a bus stop and two interstate highways (and you will see planes overhead starting to descend towards the airport), so during the day it is bustling with activity but the noise is really not that bad. At night it is very quiet (apart from the occasional loud motorbike on weekend nights from the small biker bar nearby, which again is not really a source of trouble other than the occasional loud engine noise). Walls are thin so you will hear it if your neighbor is being loud, but it was never a problem for me, my neighbors were very quiet most of the time, particularly at night.
John was a great host and he is quick to reply if you need to reach him.