We stayed at Ken's while in town for Metallica playing with the Symphony at the new Chase arena. Public transport was close and easy to use (he even gave us some clipper cards that previous guests had left a few dollars on) and we made the most of it. We also used the guest parking spot for our rental car (we drove out of town 2 days). The space is a little tight for a mid size car, so definitely bring a smaller car!
There are plenty of great places to eat within walking distance - we loved Wise Sons deli! The space is small and cozy and it was perfect for 2 of us. Ken had lots of books and information on local things to do, which was really helpful. Ken met us on arrival and showed us how everything worked, and was super friendly. It was a great experience and we would absolutely stay again if we return to San Francisco.