You sue the landlord immediately after signing the contract and get thousands of euros in a few years... Just be a member of Mieterverein, pay them that 70€ a y

You sue the landlord immediately after signing the contract and get thousands of euros in a few years... Just be a member of Mieterverein, pay them that 70€ a year and you pay nothing else for the lawyer. I know a few people who took way too expensive rental contract, sued and got the money back in court. It is annoying that you need to do this, but there is a way and it only costs your time.