He'll feel right at home on Lombard Street, it's on Russian Hill.
Actually, Russian Hill isn't a large Russian community as it once was. You can go to the Richmond District in San Francisco for that, though. San Francisco has several large Russian communities, but they're sort of cordoned off from one another (oddly enough, by religion--there's a Russian Jewish community, Russian Orthodox community, etc, and none of them really interact with each other).