There is no travel allowance. You get a VNA ticket in your mail slot.
Hotels are generally very nice (4 star, 5 star) individual rooms
No perdiems on layovers. Each contract or contractor is different, but part of your salary is called perdiems, and that covers every day of your contract.
EXAMPLE from 2 old contracts of mine:
Euro Pacific Remuneration:
Salary: US$4,500 per month
Per Diem: US$750 per month
Accommodation Allowance: US$750 per month
Total Package: US$6,000 per month
pro-rata, Vietnam tax free
Please note: The above package includes basic salary, per diems.
or
Parc
6 SALARY & PER DIEM USD 5,000 per month pro rata
7 ROSTER PATTERN Vietnam Airlines operate a roster pattern of six weeks on duty followed by two weeks off duty with a return economy ticket provided on Vietnam Airlines network (upgrade to business class on a space available basis)
8 ACCOMMODATION Parc shall provide an Accommodation Allowance of USD 1,000 per month to each First Officer to arrange accommodation at base accommodation at layover stations other than base.Vietnam Airlines shall provide hotel accommodation at layover stations other than base.