A comfortable oasis in the Sunset District with lots of amenities nearby -- restaurants, cafes, shops, Golden Gate Park, the ocean -- and within easy reach of the rest of the city thanks to the Muni. Eileen is the consummate host, with great local recommendations, and she even had a fresh loaf of sourdough bread from a local bakery waiting for us on arrival (a lovely touch!).
Note that 19th Avenue is a major thoroughfare, so there is traffic noise, but it didn't bother us at all in the well-appointed apartment or restful back garden.