The terms and conditions on the German-language homepage apply.
In plain text:
With a stay of min. for 4 nights, a deposit of € 150 is to be paid in cash or by credit card to the property.
In the event of excessive contamination of the accommodation, we reserve the right to charge a special cleaning fee of up to € 200.00 (net).
In the event of damage to the accommodation due to insufficient ventilation, the guest is liable to settle the damage.
If you smoke inside the accommodation, we charge a special cleaning fee of up to € 200.00 (net).