Brokerage contracts may not be terminated during their validity without a weighty reason. A weighty reason may be constituted by a significant mistake made by the agency, the customer falling ill or the illness or death of a family member of the customer. Changes in circumstances may also constitute grounds for termination if the continued brokerage of the apartment could become excessively disadvantageous to the customer.
However, if you are uncertain about the agent's expected performance in selling the apartment, it is a good idea to make a contract for a shorter time, for instance one month. This is prudent, as brokerage contracts may only be terminated for certain weighty reasons.
If the agency has made a material mistake in their work, there may be grounds for termination of the contract. Ask your local consumer advisor for more information.
The real estate agent
The real estate agent's liability for defects