By public transport:
The underground station "Rathaus" (U2) is just a 2-minute walk from the hotel. Take the exit for Josefstädter Straße.
From the Westbahnhof (Western Train Station):
Underground line U3 (direction Simmering) to Volkstheater, then change to U2 (direction Stadion).
From the airport:
Take the CAT (City Airport Train) to Wien-Mitte/Landstraße. From there take the U3 (direction Ottakring) to Volkstheater, then change to U2 (direction Stadion).