Well, I give up. I recieved my first "3" in location. I live in a townhouse community with reserved parking and private security patrols 24/7. I had a guest check-in who was a brusk miliary veteran type, with two grown sons, one in the Army and the Navy. He was in town for a school graduation. At the end of his stay, mostly 4 stars in all categories, a 4 overall, and a "3" in location.
The guest was new to AirBNB, no previous reviews and I can only think that he thought 3 was the standard and a 4 or 5 stars meant stellar service. Perhaps also felt that my house was too far from what it was he wanted to do. The only good thing was no negative public comments and I was very happy to see nothing about the place being unclean. I had recent bad experiences with two guests claiming the place was filthy when both times it had been cleaned thoroughly.
As for "location" - I give up!