Hi, happycc,
I just joined this message board, and happened upon your post. I'm almost embarrassed to make this suggestion, because we only lived in the Bay Area for one year (last year), and you've been there a while, I assume, and probably already know this--but still, I'll post just in case you still haven't found anyone to rent your room: When we were getting ready to move to the area, I found such a lot of great information on the Berkeley Parents Network (www.berkeleyparentsnetwork.org). People posted there from all over the place; and through it I even ended up finding a Tiny House community I could stay in while I was house hunting for my family (and the people were lovely!).
Again, probably something you've used already; but I thought I'd put it out there anyway.