Ledererhof 9 1010 Wien
Das Bürgerliche Zeughaus, Am Hof 1010 Wien
The city armory was built in 1562. This building became the city’s firehouse headquarters in 1685. Modern Austrian firetrucks are still designed to fit through the carriageways.
Operngaße 4 1010 Wien, Hof, courtyard
See also the extraordinary exterior here.