Where to stay?
San Francisco or The Bay Area is seperated into different regions. You'll want to make sure you locate yourself in the right one for easy access to meetings as traveling from one to the other can be time consuming.
Most people fly into San Francisco. The Airport is 20 minutes from SoMa/Central with no traffic.
The South Bay is easy to get to via the Caltrain or driving. Note that Mountain View is 1 hour south of the city.
Oakland is easy to get to via crossing the Bay Bridge or taking the BART (metro). It's 16 minutes by BART to Downtown Oakland. It takes longer to drive with traffic.
There are plenty of Ferries that go from the Ferry building to various places including Oakland, Sausilito and Merin County.