We stayed 4 days in the apartment of Brain & Leah, which is super well located in the trendy Mission district. Few minutes away from cool bars and nice restaurants. Also Dolores Park and Castro district are within a walking distance.
It is super easy to get to the apartment from the SFO airport as the Bart station is just 10 minutes walk away. (the metro station surrounding is a bit creepy due to a high amount of homeless people, it is not dangerous, but I recommend to walk down to the apartment via Valencia street and not via Mission street)
The apartment itself was very clean, the bed and the sofa were very comfortable and it matched 100% with the description on airbnb. Kitchen was very well equipped, so you can cook at home if you don't want to eat out every day.
Brian provided us a list with good advices of all kind and was very helpful when answering some initial questions we had.
Overall it has been a very good experience. We recommend both Brian&Leah as 100% reliable and very friendly hosts and the apartment as a great place to stay in San Francisco.