Originally Posted by
IAN-UK
I have used Hanoi Airport Taxi a number of times, and they have never let me down. Driver will meet you with a name board. Mail them and they'll get back to you within 24H
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Cost is $15 from the airport, $12 back to the airport.
Unless someone else is picking up the bill - DON'T TAKE THE HOTEL CAR

I did this, and it was exactly as you described. To the penny. It was perfect, the drivers were on time, courteous, knowledgeable, etc.
The only problem I had the entire time in Hanoi was that several taxis refused to take me to my hotel (Sheraton) - from old town. I have no idea why, it's relatively far, in a decent part of town, etc. Any ideas why?