It a low offer kabayan.. if you take that job offer and eventually finds another company here in Qatar you may not be able to transfer smoothly after you finished your contract because for your info, companies here require NOC (No Objection Certificate) from previous company to transfer to another company.
BEtter to look for other job offers. At least take basic salary +3000, with free accomodation & Transportation.
Take note: the cost of living here in Qatar is high.