My stay at Jo's was great! The location is excellent and makes for an easy walk to any point in the Gaslamp Quarter. Even though there are clubs and bars on the street level there was no noise in the apartment. Everything was neat and clean when I checked in. The building is older but the appliances and furnishings are newer. The unit did have older hardwood floors which I found a nice touch, personally.
The only real difficulty was the parking situation. Currently, during COVID, 5th Ave is closed in the section where the building is. That makes access a little tricky. There are garages near by managed by ACE Parking. I recommend downloading their app and setting up an account so you can pre-purchase daily parking passes for the duration of your stay.
I highly recommend staying at Jo's place for your San Diego visit!