Considering the Atrium Rheinhotel in Cologne?
A VT member wrote the following comment about visiting Cologne:
Fastelovend - Carnival by IceBear7
A great time for being in Köln - Karneval. Rosenmontag. The whole city is a big party, there is a fantastic parade, with music and beer and flowers and chocolates, and even more partying afterwards.
More info in my travelogue!