When I put "2130 Fern St" and "San Diego" in the search field, one of the sites that came up was a Vacation Rentals site. It appears that they've turned the little house on Fern Street, that my grandparents built in 1920, and sold in about 1950, into a vacation rental. For $120 a night, anybody can rent the place out and enjoy living in the middle of San Diego. It has only one bedroom and one bathroom, but sleeps four somehow.
Here are some screen shots from the Vacation Rentals site for 2130 Fern Street:
The bottom-right photo on the screen above shows, I think, the back door area. It looks like there is a covered patio in the back yard.