No idea about the Al Misnad Compound.

The mailing address in Qatar will be the company you work for.

However, you may rent a box at General Post Office for an annual fee of Qrs.145/- (This is the smallest box), and a one time charge of Qrs.100/- for the electronic card key. If the card is lost there is a charge of Qrs.100/-. The year begins on 01st Jan. There are also post offices around the country where boxes are available so you can rent one in your area.

USD1 = Qrs.3.64

Angelo