If you want to learn more about the ‘Red Vienna’ of the 1920s/30s, I recommend a guided tour of the Karl Marx Courtyard and the Washhouse Museum. I learned a lot about historical socialist housing policy & puppet theatre about trade union labour struggles. The Karl Marx Courtyard, which is over a kilometre long, could be seen as a historical forerunner of the #superblock concept with over 1,300 flats, businesses, and social infrastructure.
@annaloffing
If you happen to be in Vienna on a Sunday: Guided tour in german without reservation.
Worth the 12 Euro (entry to Washhouse included).
https://dasrotewien-waschsalon.at/fuehrungen/sonntags-fuehrungen