Please check the lists below to find out when the maintenance will occur for your room. Make sure to be at home around the time of the maintenance, because they won't enter your room if you are not at home. Or make sure that someone that someone can be home on your behalf. For the cleaning of the ventilation shafts, it goes per two rooms, since the two rooms on top of eachother are connected. For this reason, also make sure your up/downstairs neighbour is aware aswell.