These fantastic and safe apartments I found in the small Bavarian village Dietfurt an der Altmühl. They are what remains of city walls and fortifications from a time when the village was larger and more important. Now they suddenly appeared when walking along a sloping street of sleepy single-family homes.
A little San Gimignano north of the alps, almost.
The door was tiny, as were the windows, but it will definitely keep away angry knights etc.