Ava's place is great! It's comfortable and not too far from the BART station and restaurants. Ava is welcoming and she and Nico are quick to answer questions. I stayed with her for four months and never once had a problem with anything. As everyone else says, the bed is super comfy.
Please note, as with most areas of San Francisco, on the way back from the BART station, it is a bit of a hill to walk up, but I got used to it quickly :)