There are 2 Noi Bai airport hotels.
I thought I booked the other and so went to the wrong hotel.
This one, although close to the other is across the other side of a busy 6 Lane highway and difficult to find., whereas the one I intended to book is closer to the airport, just a short 10 minute walk along a path to the right immediately upon exiting the airport. Do not walk out to the airport car park.