Hannover
Large and impersonal town, capital of Lower Saxony (German: Land Niedersachsen). Comprehensively bombed to smithereens during the Late Unpleasantness, rejoices in a fairly fine, if somewhat teeny red light district and a Montreal-style underground shopping arcade which runs for what seems like several miles from the Hauptbahnhof.
Excellent town OTP in the 80s, has probably declined somewhat since. For more refined tastes in re red light districts, Brueckstrasse in Brauschweig is far better.