We have seen it personally before. It was with great pleasure that we boarded our cruise ship and took possession of our cabin. What we found corresponded to the descriptions of the shipping company and gave hope for two nice, quiet weeks in the Caribbean.
As soon as the ship began to move, the calm was over. From then on the piercing, whistling sound of a turbine could be heard. That didn't bode well for the duration of the trip and the already existing tinnitus symptoms. The subsequent complaint led to the realization that the noise complained of was a typical ship and therefore acceptable noise. We could be helped by moving.
Now for the legal consideration. In its magazine "ReiseRecht aktuell", the German Society for Travel Law reports on a similar case in which the Rostock Regional Court had the right to speak. What happened? Guests in the Premium Suite of a cruise ship complained about a reduction in the travel price. During their trip to the Caribbean, the plaintiffs were booked in a cabin with an inlet for the ventilation systems under the sun terrace. Because of the noise involved, the guests went to court.
The court found that there was no entitlement to a reduction in the travel price. Excessive noise pollution could in principle be a lack of travel. If it is within the usual range, however, it is acceptable. The plaintiffs could not have proven an extraordinary noise nuisance. The shipping company also pointed out engine noises in its catalog documents. A booked premium suite does not entitle you to a particularly quiet cabin. More on this under Az: 9 O.147 / 10 LG Rostock.