It all depends on your nationality. If you are from an Asian or Africam country, the offer is a very good one. However, if you are a western passport holder, you would be asking for the sky.
You can calculate your average monthly expenses while you are in Qatar. You will be spending an average of QR 2500 for your food and miscellaneous expenses. The rest will be in your pocket. But all that depends on your lifestyle. As for your accomodation being "not sufficient" with you possibly needing a dancing floor, you should discuss this with your employer.
By the way, just a peice of advice: While you are in Qatar, you will find plenty of free time. Suggest you use that free time to work on your knowledge of English.