This was my family's first time visiting San Diego AND our first time booking a house rental with airbnb. We had a decent experience but I probably wouldn't book this particular rental again. The house was in a good location -- steps to the beach. BUT I would caution others with families that this place might not be the best for very small children -- it's super noisy on the weekends as Mission Beach is kind of a party beach and you are right by a main road -- so the combination of people walking by your house all night long and cars driving by makes it somewhat difficult for little ones to sleep. Also there was no central heat in the unit, and at night it did get chilly. We used the provided space heater but that's not super kid friendly either.
Overall the rental was pretty clean, however we did see two small cockroaches in the kitchen, and some mice poop in the utensil drawer.... I guess this might be expected at an old renovated beach bungalow -- but it grossed me out.
When we go back to San Diego I'll probably rent something right on the beach, away from the busy street or up in La Jolla.