This is a very comfortable, clean, elegant and well-appointed apartment in a great location. We stayed as a family with our 3 teenagers for 3 nights whilst we saw the sights of Berlin. We left our bags in a luggage room before we checked-in and after we checked-out which was great - and the instructions given to find keys etc were easy to follow. There definitely are rules, but if you read them beforehand and bring the exact cash you need for the tax when you check-in they shouldn't be a big problem.