This was the first Air BnB for my wife and I and it was a great experience for us. Fir was a great host. He was very responsive in the app and provided clear instructions for check-in. He greeted us when we pulled in and was available throughout the stay.
The room was extremely clean and was exactly what was shown in the pictures. I would compare the building (there's multiple rooms throughout) to a very nicely ran boutique hotel. The bed was pretty comfortable and had good pillows and bedding to make the nights sleep pleasant.
You do deal with the plane noise being so close to the airport, but Fir and his staff were nice enough to provide ear plugs. Also, the location is in a prime spot giving easy access to downtown SD, the Zoo, Little Italy, and not too far from any of the popular beaches. There are plenty of restaurants within a quick drive.
I would suggest to anyone staying here to pay the extra parking fee for the peace of mind. 6th ave is very busy and active all day and night.