Jasons place was very nice and quiet. We stayed here (my wife and I) because of the price with a private bathroom and it seemed close to San Francisco. Everything was as described.Bart was only a short walk away and about a 10min ride into SF. I did not get to meet Jason (due to us only being around early and late) but he was very helpful and let us know he would take care of anything we needed.
There were some past reviews that I believe complained about how long of a walk it was to bart. It is not very far at all. I never timed it but maybe 10 min. If I remember correctly there were also some reviews complaining about the neighborhood. Yes you will see some graffiti around, but I never felt concerned at all while walking to and from Bart. We actually came back every night well after dark and the streets and neighborhood was very quiet. No worries at all.
If you are looking for a nice, quiet, affordable place to sleep and explore SF out of, this is it. We did not get to explore Oakland in our short stay but hopefully next time we will.