I stayed at Mark's place for almost 3 months and it has been absolutely fantastic!
The flat is well equipped with new appliances that all work flawlessly.
It also is nicely stocked. I had to buy almost no essentials as they were all provided by the host (talking about stuff like salt, oil, dishwasher tabs, shampoo, soap, etc)!
Mark and Jessica are fabulous hosts! Communication was easy, very pleasant and fast. They live nearby so if there's ever an issue (which was almost never the case), they fix it in minutes.
Finally, my highlight: the location. The area has so much to offer in terms of restaurants, bars, coffee shops and more. It's ridiculous how close everything is. Valencia Street is arguably one of the best streets in the city for all of the above and you will not be disappointed. Check out Bar Part Time, Standard Deviant Brewing and Zeitgeist for some great nights. All of them are within 5min walking from the flat. Get a coffee at Four Barrel and make sure to try Burma Love, Dancing Yak and Shizen Vegan Sushi (again, all of these are 5min or less walking). Furthermore, the BART station is very close and Mission Dolores Park as well. I could not have thought of a better location to experience San Francisco!