Have an upcoming trade show in Cologne, but the hotel prices are through the roof as always. Since I'm paying out of my own pocket, I figured I'll stay in Dusseldorf and take the train in to the show every day. Anyone have any recommendations on hotels in Dusseldorf (3 to 4 Star) that are comfortable for the business traveler and within a 5 minute walk of the train station? Something with a balcony would be great.