Service charges, care package fee, extras: three items governed by three different sets of rules. What you owe, what you may inspect, and where the common errors hide.
After 30 years in the same apartment almost everything is written off. How the useful-life table works, what counts as normal wear, and when the deposit must be released.
Reference rate, renovation surcharge, official form: how to check an increase, challenge it free of charge within 30 days – and what else helps on a fixed pension.