It literally is 3-5 minutes walk from the station. At the train station go to the exits for "Centraal". When you walk out of the building turn left, and stay as close to the building as possible (there's trams and all other sorts of obstacles otherwise). At the very end of the building, cross the tram lines (watch out for trams, busses, and bikes!) and you'll see the DoubleTree by Hilton in the near distance looking like a high-rise polygon! You check-in at the far end of the building so just walk along it on the right-hand side, past the lounge and City Cafe, and you'll see the entrance at the end. Enjoy!