Many of the taxi drivers at the airport are on comission from the hostels in Hanoi. They may agree to drive you to the city centre and then tell you your hostel has closed down once you get there. Don't listen to them and insist that they take you to the correct hostel. If they don't, just pay them and get out of the taxi, walk to the nearest bar, and figure out how to walk to your hostel.

It may be worth emailing your hostel and arranging an airport pick-up in advance, most of the larger hotels and many hostels provide this service.

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