Fantastic stay and I highly recommend, especially if you just need a home base in San Diego and don't plan on spending a lot of time in the unit. It is small, but it has everything you need (bed, toilet, shower).
The location is in a good place, you are close by to pretty much everything you could want to be. The Zoo, Gaslamp district, La Jolla, the airport, etc.. The area is also relatively nice, I was not concerned for my physical safety or leaving the car parked in street parking.
A few things worth noting, which the host fully discloses in the listing, are:
1) The location is directly in the flight path of SAN, and the planes are LOUD. However, the host provides ear plugs, which combined with having the AC fan going, pretty much solved the issue for me. Additionally, the later it is at night, the less air traffic there seems to be. All in all, it wasn't an issue for me, but worth noting.
2) There isn't really dedicated parking. I never had an issue parking, but I did have to walk a couple blocks on occasion. Not a big deal, but worth mentioning.
3) The shower for this unit is outdoors. I did feel like I had adequate privacy using it, and I never felt concerned, but I'm a fairly sizeable man. A solo woman traveler may feel differently. However, there are common area restrooms/showers inside the larger house which you may use, if the outdoor shower was cause for concern.
Again, all of these things are disclosed in the listing, but I think it is worth including in the review.
All in all, I would absolutely recommend this stay to anyone who is interested in visiting San Diego. It's a great value, great location, and very cool place to stay. Thank you to the host for helping make my stay memorable!