1. When booking the app, I didn't state that I have to pay additional City taxes. 2. Reserve a Double bedroom, but get a Twin bedroom. 3. Borrow the Adapter, have to pay a deposit as well. Before coming to Amsterdam I went to Vienna, Budapest and Prague first. Impressed by staying at hotels in all 3 countries, never thinking of the worst event with a hotel stay in Amsterdam. However, when comparing the room price with the service I felt that it was the worst hotel stay on this trip.