From the airport by public transport (train/subway):
- Take the the S7 or CAT train until you reach the station “Wien Mitte”.
- Change into the subway U4 (green line) for two stops until you reach “Karlsplatz / Oper”.
- The subway station is very big, use the exit “Resselpark”. From here you can walk to your apartment at Wiedner Hauptstrasse 5, 1040 Vienna.