First of all, high employment opportunities. Foreigners won’t have too much trouble in finding right job.
The transportation are diverse, with buses, taxis, motorbikes, bicycles, cars,…
In Hanoi, there are full flights to many parts of the world.
Hanoi has unique culture with many unique architecture, diverse cuisine, beautiful scenery, appropriate weather,..
The standard of living isn’t so high but it’s very diverse, suitable for many social classes.
Hanoi people are natural, friendly and very hospitable.