I only had contact with Santiago, the co-host, but he did a really great job.
He enured that I wouldn't have any problems with check-in (since he was not at home when I arrived), and made sure that I had everything I needed. He even helped me out with the print-out of some documents.
The house and the room were really nice, and exactly as in the pictures and about a 10 min walk away from the BART Station.
Would definitely book again or recommend to friends.