The life in Doha is very expensive I'll try to give examples:

Accomodation is around 6000-8000 per month,2 rooms .
Medical is free from the country in the government hospital.it's nice one but little bet crowded due to free one.
The car arround 1500-2000 as credit for 1300-1600 CC.

The offer sounds good u can manage to live & yr wife can work with arround 7000-12000 so it'll be amazing life..
The life here is so relaxing & 100% peace

I'm coming from the lost Paradise