The ibis budget Wien Messe is near the Austria Center Vienna, Donauin sel, Praterstern train station (high-speed line to Vienna Airport) and the city center/St. Stephen's Cathedral are all within easy reach via the U-Bahn (subway), as are Prater park and UNO City. The Austria Congress Center is at 10 minutes by metro and 30 minutes walking.
Train - direct from the airport - S1 - S2 - S3 - S4 - S7 : Wien Praterstern Metro U1 : Vorgartenstrasse Tram 5 : Praterstern Bus 82A : Harkortstrasse