Very beautiful flat with lots of space. We enjoyed the backyard as well. It was about a 10min walk from the BART but generally we took Uber. Very close to a grocery store and bakery for morning goodies.
Even though you could admittedly hear noise from the street if you were in the front living room, it didn't bother us at all, as noise did not really carry from front to back.
There were 7 of us, and 4 people shared 2 beds, 1 person took a double, and 2 others took the single and extra air mattress, and it worked out great. San Francisco accommodation costs tend to run high, but we tried not to think about that and just enjoy the space. The neighborhood was a lot of fun -- so many restaurants!