my husband is also a QP engineer who works offshore for approximatly the same offer you have ,so according to my own experience i'm telling u thats a very good offer.......

FIRST: we have the same accomodation as u (10500) which we already save 2000 from it....as we took a super deluxe 2B/R semi furnished flat....and u must know that there is FURNITURE ALLOWANCE of 40,000QR which is pretty enough and also u can save from it.

SECOND: u will only pay your monthly house needs and maintenance...i mean food and grocery ,also your entertaintment.
i dont know how many kids u have but if u have 2 kids ,so your monthly budjet for this item will be around (4000 to 6000) QR, if u live in a moderate lifestyle.

THIRD: about your questions....
a)yes ,i think this job is very worth and u will save more than dubai.
b)yes ,salary is negotiable.
c)i dont know what grade is my husband...but i will try to ask him.
d)they dont negotiate rents moreover i know that company accomodation in meisaeed is not finished yet..they still work on it.
and anyway if u work in doha then meisaeed will be very far from you,but trust my word 10500QR is very good to live in a luxury flat here.

WISH I HELPED U ,AND HOPE U TAKE THE RIGHT DECISION ......GOOD LUCK