Very very bad. This is the worst Hotel or Hostel I...

Very very bad. This is the worst Hotel or Hostel I have ever seen.
Last week I was there, It was -10 degree in Hamburg and the heating system was not working !! And when we made a conplaint, the receptionist told us there is a big problem in the heating systems of the hotel and they couldn't do anything!!!!!
At night during sleeping, another client entered our room and we discovered the receptionist gave him our key room by mistake !!!
The room service was very baaad .. toilets are very dirty and the service did not clean the room even after two calls