By train:
From the airport take the train RB22 towards Königs Wusterhausen, travel for 14 minutes and disembark at S Königs Wusterhausen Bhf station. From there change to RE2 towards Cottbus Hauptbahnhof station, travel for 48 minutes (5 stops) and get off at the last station. You will be able to find the hotel across the main railway station.
By car:
Despite the usual traffic, the fastest route is via A13 and A15. The travel time usually lasts 1 hour and 25 minutes.