Franziska's flat is very conveniently located for visiting museums and historic sections of Berlin. Only a few minutes on the M 10 trolley to Nordbahnhof from the Hauptbahnhof and then a couple blocks to the apartment. A large grocery store is next door and there are many bakeries and other shops near-by. The S-line of the underground from Nordbahnhof brings you to many of the sites in a very few minutes.