Do not book John's place or any other places you find in his name.
I had a late night flight and I got to the apartment at 2 a.m., I tried to enter the main gate code John provided me, but it didn't work. I tried several times without success.
Since on his profile there's no phone number, I could only send him a message via the Airbnb app, but of course, given the late hour, he didn't reply.
In the meantime another client showed up in great distress with the same problem and that shows how John's careless behaviour was affecting more than one person.
Long sorry short: I had to check for another hotel in the middle of the night and the day after John didn't even apologize.
Hope Airbnb will take measures against this guy. I had only two days in San Diego and what happened really ruined my vacation.