THE FASTEST WAY FROM THE AIRPORT
You can take one of the taxis on the airport or you reserve one with a fix price: http://www.flughafentaxi.at
CAT: direct fast train to the city and then by tube or taxi to the hotel: http://www.cityairporttrain.com
Schnellbahn S7 or ÖBB Railjet: direct trains from the airport to station Meidlinger Bahnhof, then one station with U6 to Niederhofstraße: http://www.schnellbahn-wien.at