There is huge variability in the SF housing market and great deals tend to go quick. I'd put my stuff in storage and stay at a long term hotel for a few weeks and be really careful about this, after all you're talking about spending 12-20K a year.
You can get a decent hotel around the airport for like $60 on hotwire, which is really pretty cheap for SF.
http://www.housingmaps.com/ This is useful.
>despite in-depth emails Too long and you'll get no response just like any other CL ad?
One random note : some places require a social security card.
As for the Social Security card, hopefully that's not commonly a dealbreaker…
Thanks for the advice.
One other point: come with your checkbook and be ready to put down a deposit on the spot. Don't rush your decision of course, but places go /fast/ and you'll want to act quickly to ensure the place you're looking for doesn't get taken.