We recently stayed for 5 nights in Mark's place to attend the AGU meeting in Moscone center. Mark's place was so convenient that we can easily use different public transport facilities (e.g., bus # 35, 24) to go to different places. Those buses are within 2-3 mins walking distance and very regular until 11 pm. We did not feel any discomfort during staying at Mark's place. Mark is really a great host with strong personality. He was very co-operative and helpful to us. His house was very neat and clean. I really liked the city view from his living room. It was really amazing. We strongly recommend his place for a safe and secure stay at San Francisco.