Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Surakarta City (39% of total searches to Central Java). The next most popular destinations are Semarang (37%) and Magelang (12%). Searches for hotels in Karimunjawa (12%) are also popular.
KAYAK users have found double rooms in Central Java for as cheap as $8 (Wonosobo) in the last 3 days. The average price is $30.