Sorry to say but reading this as a native Berliner is really difficult.
It seems like the author has never spoken to any German that has been involved in housing in the last 10+ years.
I can only second what others in the comments here have already pointed out: current housing and housing prices feel fundamentally broken and completely disconnected from wages and realistic mortgages.
I can only second what others in the comments here have already pointed out: current housing and housing prices feel fundamentally broken and completely disconnected from wages and realistic mortgages.