Hidden fees are charges in case the hotel staff finds something broken or damaged in the room. I then call to claim a refund, and they tell me the money was used to pay the platform where I made the reservation and to pay for parking (coincidentally, according to them, the same amount they charged me for the first). Also, when I got to the room, the sheets were stained, and when we got to the room, there was a seemingly used sock behind the armchair. The music from outside could be heard in the room until around 4 a.m.