Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Vienna (50% of total searches to Donau). The next most popular destinations are Budapest (39%) and Belgrade (9%). Searches for hotels in Bratislava (2%) are also popular.
KAYAK users have found double rooms in Donau for as cheap as $18 (Budapest) in the last 3 days. The average price is $271.