In my opinion, there is no way in hell Aikido of Tamalpais is anything less than a wonderful and true sanctuary (dojo).
It's a great dojo. I still consider it my "home" dojo in the Bay Area.
However, there are at least a few dozen dojo in the area within an hour's drive, many of them really good as well. As I've said before, I would try to check out as many of them as I can.