The guest house was lovely and it was a great stay overall. The place was clean, the bed was comfy, the water pressure was good, there was tons of light, the patio area was very nice, and it was very quiet and peaceful at night (just a few birds in the morning and the occasional motorcycle or plane). Mark and Chad were great hosts and clearly know how to run an Airbnb very efficiently.
The only negative we found was that the wifi was unusably slow. We tried to run a speed test and it registered only 0.9 mbps download and then stalled out while trying to do the upload part. They were responsive when we mentioned it but weren't able to fix it while we were there.
One other thing to emphasize is that the guesthouse gets very bright in the morning even with the skylights covered since there are several windows with light-filtering bali blinds. Also there was body wash and shampoo provided in the shower (seemed like fairly good actually) but no conditioner.
We were pretty happy with our experience and it's in a great location - only 10 minutes from downtown SD and maybe 20 minutes from Pacific Beach / La Jolla.