It's a long time ago - about 2001, I think - but I remember that a crazy old Irishman used to give Irish dancing lessons in the big back room of the
Oscar Wilde pub in Friedrichstrasse. Pretty popular, I think. Bear in mind that I believe the pub has changed hands once or twice since then, and maybe it has turned into more of a sports pub, I'm not sure. But if you're in the area - I think the exact address is Friedrichstrasse 111-12, just bfore the right turn into Oranienburgerstrasse - might be worth a try. Its telephone number is 2828166.