Offer valid until January 21st 2018: 
For those who haven’t booked accommodation yet: the NH Hotel Oberhausen just around the corner from the festival area offers a “Pop-up Days” deal which means: free breakfast. This will save you around 25% on a double room.
Offer valid until January 21st 2018!
Follow the link: https://www.nh-hotels.com/deals/pop-up-days