There's no free lunch. Housing costs are effectively carried by immigrants and transplants: https://www.aei.org/wp-content/uploads/2023/09/Setting-the-r...
In general, the Vienna model is very difficult to copy without being in extreme conditions: https://www.threads.com/@__smiz/post/Cxpz28CIkT6
Many people also don't know that Vienna was isolated and divided for nearly 50 years during the cold war. A significant amount of the available housing is due to Vienna having a bad economy for almost a century.