Impossible to say
That's to broad a question in my opinion.
Are you single, single & commuting, family, family but commuting.
Where are you from, what are you accustomed to, what can spouse tolerate.
You can rent from a room from $400 to a Villa for $5000 plus
snap.com.vn (no affliation) that's HCM, Hanoi same or more.
Are you going live dangerously ride a motorbike,
or taxi it or rent a car/driver or even buy a car (it can all be done)
Kids: private school $€£¥!!
Spouse boredom begats shopping£€
Local girlfriend(s) could have beer to Dom Perignon tastes, is that additional to spouse or not!!
Are you going to eat local or at chillsaigon.com
Pilots seem to live the full spectrum. Some very flash/bling some a very modest more local style