I honestly don't think such analysis is really useful. It seems to me like the AfD voter base is a diverse "anti-mainstream" coalition. The AfD is strong in east Germany since it's traditionally more right-wing and more anti-mainstream.
The AfD is also strong in Baden-Würtemberg which is traditionally a place with a high population of... well... luddites(?).
These groups might not have the same goals or the same issues they are facing, but what unites them is the feeling that the AfD represents a true opposition to the mainstream political scene.
https://www.zeit.de/wirtschaft/2021-02/mietpreise-deutschlan... claims that the lowest rents in 2021 were in Elsterberg in Saxony.
https://interaktiv.tagesspiegel.de/lab/bundestagswahl-2021-k... shows the AfD getting 25.7% of the vote in Elsterberg during the 2021 federal election, ahead of all other parties.
You may worry about the cost of housing in big cities, but I doubt the typical AfD voter does.