What do I do if my landlord/lady terminates my lease agreement all of a sudden?
If the landlord/lady terminates the contract and the tenant disagrees with that decision, the landlord/lady is obliged to go to a judge to get the tenant out of his/her apartment. This is part of rent control. As long as the judge has not decided that the tenant has to leave the apartment, the lease agreement is still valid. This is even the case if there is only a temporary lease agreement. There are a few exceptions, for instance with 'emergency use' by the landlord/lady (see question 'On what grounds can my landlord/lady terminate my lease agreement').
If the tenant appeals, the lease agreement usually remains valid until the judge on appeal has decided that the tenant has to leave the apartment.
If the tenant does not appeal, the decision of a judge of the lower court will become definite and the tenant can be forced to leave the apartment if the decision fell in favour of the landlord/lady.