Looking for San Francisco locations only

I'm a current Stanford graduate student looking for housing around the San Francisco area (proximity to Caltrain is a must). I am looking to move in approximately September 15.

I am a male, mid-20s. I am a social, respectful person who is clean. I do not smoke. I am OK living with just one person, but I enjoy living with multiple (2+ people) in an apartment or house.

My only hard constraints are that:
The location be close (~10min bike) to a Caltrain stop,
I have a private bedroom,
I have a bathroom (shared OK), and
I have a place to park a car (street parking OK).

Happy to answer any questions!