Jason's place is very convenient for exploring the city. It is in the heart of the Mission District - one block down there is the BART station that can take you to Union Square or anywhere you'd like to explore. A couple of blocks down are tons of cool shops and restaurants, as well as beautiful Dolores Park. I was here for a wedding in the Mission, and this was perfect for this purpose.
The amenities Jason offers are great. His mom checked me in and showed me the kitchen items (tea, cereal, eggs, beer!), as well as all of the small bathroom items and guidebooks in the hallway. The place is pretty clean, and having 2 bathrooms meant that one was always open. It did not seem like I saw the other people staying in the rooms at all.
The noise does carry a bit between the walls. At night, on weekends, you can hear some of the street noise of people partying, and when a guest comes home at a later hour, I could hear them in the kitchen etc. even though I could tell they were trying to be quiet. All in all though, those things were minor and you really can't beat the price at such a central location. The double gate/door combo also made me feel very secure.
One reason I gave this 4 stars instead of 5 is because the furnace was not working and I froze my butt off during the nights I stayed there. It was probably half my fault since I did not think to ask about central heating, but apparently the furnace was broken and I (being from Hawaii) came home to a non-heated home while the outside was ~43F. I asked Jason for an extra blanket but he gave me a little space heater instead, which helped a bit. So just make sure that if you get cold easily, to ask about the furnace in any airbnb! I for sure will for next time!
All in all, Jason's place was great and he was a great host. I recommend his place if you'd like to explore SF.