Just to reaffirm what most reviewers already said, this place is within the prime location of San Diego, especially if your goal is for Gaslamp & it's nightlife scene. The stay is reasonably priced, but also has a $20 parking fee per car per day. Communication with the host could be better.
My main concern was the amount of noise you could hear from the unit above. As this stay is a converted garage for the top floor, you can HEAR EVERYTHING. Things like people walking up and down the flights of stairs throughout the day and night, people talking, walking around, and even playing music.

Also, parking is shared between units and is in front of the location, you will hear cars coming in and out all night, and people talking. I could not sleep at all.
My advice is that if you want a cost-effective place to stay for a day or two and don't mind the noise, book this place...
But, if you value your sleep or are planning to stay longer than a couple days, book somewhere else.