Stayed at 830 Park Blvd. #305 for a week. The description given by the listing is accurate. The studio is freshly renovated, very clean, with a fitted kitchen and all the necessary amenities. There is a grocery store just a couple of blocks away. The location is great for San Diego downtown, just 10 minutes walking from Gaslamp Quartier. Public transit stops are nearby, too. The self-check-in procedure was very easy and convenient. There is also a storage room in case one needs to leave luggage for a few hours after check-out.
As described in the listing, it is an old building that is not sound-proof. It is true that one can hear the street noise. Having said that, after quite an intense exploration of the city during the day, I was falling asleep every night as soon as I touched a pillow, so the noise did not bother me much.
Last but not least, Matt is a great host, a very responsive and helpful one.
I will definitively look no further than 830 Park Blvd should I stay in San Diego again.