We enjoyed a week-long stay. Echoing other reviews: very clean, comfy, great location, quiet, nice furniture/decor, photos accurate, hosts accommodating and great at responding, master (king) bed very firm (perfect!), second bedroom (queen?) maybe not quite as firm, and neighborhood parking can be crowded (and the road outside is on a steep-ish hill).
Given the great location, we did not have a car - we walked, bussed and scootered everywhere. It's an easy walk to Balboa Park (zoo, museums, etc.) and the Hillcrest neighborhood (fantastic farmer's market on Sundays, lots of shops and restaurants), and it's a moderate walk (something like 3-4 miles) to downtown (checking out the library), Gaslamp, Little Italy.
The kitchen was great - we made our own breakfast and dinner in the condo each day.
It's important to note that there is one flight of stairs to get to the main floor, an additional flight to the bedrooms, and a third flight to the rooftop terrace (it's got a great view!). All in all we were extremely pleased and would definitely stay again.