according to me will be ideal for you, since you're area of work is Al Hilal. A 3 bedrooms FF apartment (not in a compound) is QAR 8,500. I know this because a friend of mine recently moved into one at the old airport area. 2 bedrooms FF is about QAR 7,000. But these are with reputed real estate agents.

You will get cheaper accommodation, if you go for unfurnished and with lesser known agents.