I had a great stay at Mark's place! The apartment was beautiful, very clean, and well-located. The room itself was indeed petite, but it's perfect for the solo traveler. Mission St. pops off on weekend nights so there's a bit of noise, but the apartment is indeed well sound-proofed and noise is significantly dulled (Mark also provides earplugs for the wary). Breakfast was thoughtful and yummy - this North Dakotan tried pomello for the first time. Location is great, with many transit options nearby, and Valencia St. (countless restaurants/bars) just a couple of short-blocks away. The apt is also right next door to one of my SF faves: Gracias Madre - the sweet-potato quesadilla is DELISH.
See you next time, Mark.