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I live a bit far from the airport, hence most taxi companies offered high prices. However, VIAT was cost efficient for me compared to other taxi companies. Besides, taxi driver is very friendly and you can be sure that you will reach destination on time. The taxi drops you just in front of the Terminal. Besides, i like how the company treats the clients-they response very quickly to your messages and consider your requests.
Basing on my experience i recommend Vienna International Airport Taxi. Have a safe flight:)