As others have said, the unit itself is clean and useable; As long as you know it's small, you won't be disappointed. I liked the place.
There weren't any extra linens and the towels provided were basically those tiny ones they provide as merely a bath mat at a hotel. I requested more towels to the host and they were brought to the room, which was a plus. It was just strange with so much emphasis on the room including extra linens in the listing that there were, in reality, zero.
I was there during record heat so I can't 100% fault the host, but there were some fixes that needed to be made involving the windows and the AC. The windows were open when we got there I assume to not waste electricity on AC, but it was really hot in there because of it. The cranks to close the windows were broken off. We had to rig something up in order to close the windows. Then the AC hose was leaking heat out into the room making it impossible to cool off fully.
The immediate neighborhood is basically an encampment for the unhoused, so the cheap lot next door is not safe I'm sorry to say, especially at night. But if you are looking for a bargain place and want to take ubers or lyfts, or park in one of the guarded lots this is very convenient to much of San Diego. Overall I would give it a 3 out of 5 and give the host a 4 out of 5.