European Union law often provides stronger protections than national German law (BGB). Here are the key directives that protect you as a tenant.
Protects you against clauses that create a significant imbalance in rights. If a clause is unfair, it is NOT binding.
You have the right to see the Energy Performance Certificate (Energieausweis) before signing.
Landlords can only ask for data they strictly need. You have the right to know what is stored.