The hotel is directly above the Rosenheimer Platz train station. You do NOT have to go outside of the station to get to the hotel. Go up an escalator from the train platform, look carefully for the Hilton signage, go up a few stairs to an elevator that will take you directly to the lobby level of the hotel. Notice that I said “lobby level”. The elevator doesn’t bring you directly into the lobby, but rather a very short hallway which then leads you out to a restaurant/bar area. Take a right and walk to the check in area. It is very easy to get from/to the train platform and the hotel.