I learned most of my German at the Goethe Institute in San Francisco years and years ago. I thought I might take some refresher classes when we lived in LA, but they didn't have classes, so I thought the G.I. didn't offer those things anymore. Perhaps it's just the one in LA that doesn't.
At the one in SF, at least, the classes were comfortable and you do hear German pronounced like it should be by native-speakers of German. Of course, my husband is a native speaker of German and doesn't sound a thing like what I learned in class.