Following the suggestion on this forum, I booked a taxi from central Vienna to the airport using AirportDriver Wien (AirportDriver.taxi). I received a confirmation and followed the instructions to be at the curb 10 minutes early. I did. And waited. And waited. Finally, 15 minutes after the appointed time. I simply hailed a cab off the street. I would not rely on AirportDriver Wien ever again.
I always recommend Uber.
This is very unusual. Did you call them? When I wait for a booked taxi and it is 5 minutes late then I call them.
I always recommend Uber.
Does Uber have a flat fare for going from/to the airport?
No but the pricing is transparent before you book. I typically pay around 40 Euro from my apartment in the 3rd. Always on time.