Alsatian Flammkuchen, biking Berlin to find the city's best waffles and karaoke in Mauerpark: the makings of a truly memorable weekend in the German capital.BERLIN — My husband, Alan, and I were on our way from L.A. to Budapest, Hungary — our first trip to Eastern Europe. We had to change planes somewhere, and that somewhere happened to be Berlin, a frequent hub for travel to Northern and Eastern European destinations.