Karin is a wonderful host! She's very quick to respond to messages and questions and is hospitable, welcoming, and friendly. I was working quite bit during my stay, so I didn't interact with Karin extensively, but when I did she was polite and very interesting to talk to. She knows a lot about the Bay Area. I decided to add an additional night to my stay at the last minute and Karin was great about making the accommodation.
When I checked in, I received a very warm welcome and a full tour of the house which was great since there's a lot of shared spaces. The house is nicely decorated and feels very cozy. The room itself is nice--very clean and comfortable with a large closet and a nice view of the hills. As for the location, it's a really pleasant neighborhood. I didn't need to get around much but walked to the small grocery store a few times for food. (They also have a small espresso bar that serves coffee in the morning.)
Overall, Karin is a great host and her house is a really nice place to stay, especially for an individual who wants a calm, quiet place to work. I would absolutely recommend staying with Karin.