In the organizer's words:

Experience winter above the rooftops of the city! From November 15, the Rooftop Bar on the 6th floor of the NOXX Hotel Marburg will be transformed into a stylish winter location with a panoramic view.
Not a classic Christmas market - but coziness with mulled wine, street food & skyline feeling. Enjoy bratwurst, crêpes and probably the most beautiful view in Marburg with Christmas music and twinkling lights.