The place was spotless and even cozier than advertised. The host was communicative and responsive and made check-in a breeze. The location is perfect and close to basically anything you'd like to do in downtown San Diego, not to mention more good food than you can possibly eat in a weekend. Next time we come back to San Diego, we'll definitely be checking the availability of this place first thing.
I think it's worth noting that apartment is street level and the front entrance opens directly to the sidewalk, so you'll hear plenty of traffic and people walking by during the day, but it was a pretty quiet street by the time we went to bed. Also, we took the train down from LA so we didn't have to deal with parking, but if you've got a car it looks like it might be a bit of a challenge to find a street spot (though there are garages close by).
But those are tiny things, really — the space is charming and comfortable, the host accommodating, and I couldn't have had a smoother Airbnb experience. Highly recommend.