If you're working in Jebel Ali I would suggest looking for accommodation in Jebel Ali. Since they're providing a 3 bdr villa doesn't that mean that they'll decide where? The school allowance might not be enough for 2 school-aged children...I would budget for at least an additional 10,000-try negotiating that.

I think the salary is ok, but whether it's appropriate for your skills and credentials I can't say. Doable for a family of 4? If you are moving to the UAE w/ loads of debt back home it can certainly restrict things. Those that are relatively debt free can save on that and take regular holidays, but it all depends on how expensive your tastes are. It's a hard question to answer, as you'll notice from this board that many people are offered much less than that and manage to survive. Since your housing is covered (plus utilities), most of your school fees are covered, and you have enough money for a decent car, the next biggest chunk of your salary will go to food and entertainment. Hope that helps.