In Vienna, around 30% of the rental units in the city are offered through socialized housing programs that are incredibly secure, and low cost. There's so many of these units, that landlords in the private market have to compete with their prices. The for-profit rental units are more expensive than the socialized units, but the average price is still very low compared to comparable cities. As a result, Vienna is the cheapest major city in the German-speaking part of Europe, and Viennese people spend a much smaller portion of their income on housing than their peers spend pretty much europe-wide.