Hi I am staying on Graben - what is the easiest way to get there from the airport?
When exiting the ubahn station (after taking the U3), use the exit that says Graben (opposite of St. Stephans cathedral). Graben 28 is located between Trattnerhof and Petersplatz..... about 100 yards down the Graben on your right.
You can also take any express train from the airport to Wien Hauptbahnhof and from there subway line U1 also to Stephansplatz. Just get whichever train comes first. Tickets cost €4.10 and can be used on either train. Avoid the CAT which is quite simply way overpriced for the 9 minutes saving it gives you.
Yes, be flexible and take whichever train leaves first, that way the waiting time will be limited.
Easiest way is a pre-booked taxi. I use Red Cab or Airport Driver.
Cherries I fully agree it’s the easiest, but also virtually the most expensive.