Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Cologne (70% of total searches to North Rhine-Westphalia). The next most popular destinations are Düsseldorf (24%) and Bonn (4%). Searches for hotels in Dortmund (3%) are also popular.
KAYAK users have found double rooms in North Rhine-Westphalia for as cheap as €28 (Cologne) in the last 3 days. The average price is €147.