one reason why vienna is better than other cities:

https://en.wikipedia.org/wiki/Gemeindebau

they saw a problem and started building

lol one complex is even called karl marx hof

edit: chart is awful indeed it features capital cities only. Berlin is still cheaper than München. not for a lack of trying tho

adequate housing supply for the housing demand.

a concept a lot of cities actively refuse to believe is possible by their obsession with limiting development.

for rents to be stable you need 6-7% of available units vacant. almost double that vacancy if you want to drive prices down.

the vacancy rate in many places is like 1%. hence the rents going up super fast YoY. in my city people bid up rent because there are so few apartments available. so it lists for 2800/mo and the person that gets it is paying 3200/mo.

my city builds like 5000 new apartments per year. the population is growing by like 25,000 people per year. so the rent is skyrocketing. we keep adding lots and lots of jobs. every new development is like 5000 jobs, and 100 apartments. where are the other 4900 people going to live?

unfortunately there is no amount of wage that prevent high rent.. on the contrary. All the city with low relative rend have rent control laws.

And they must be updated often since landlords try to sneak their way.

For exemple, in Paris, there is a fashion trend of building offering " coworking rent", where they rent you a 10m2 for exuberant price, and they justify it by having a "PC room " in the building or something. So the city is in the process of banning thoses "coworking" place, which are just a way to bypass rent control law