Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Potsdam (49% of total searches to Brandenburg). The next most popular destinations are Schönefeld (41%) and Werder (8%). Searches for hotels in Lübbenau (3%) are also popular.
KAYAK users have found double rooms in Brandenburg for as cheap as $70 (Frankfurt an der Oder) in the last 3 days. The average price is $200.