just wanted to add the directions particularly to those who are new in Doha :P

1. the Mall
basically in between Lulu supermarket on Airport Road and Regency Hall. if you are coming from Al Sadd you would pass by Al Hilal Petrol station (same side as your car) and then take your left (outermost left lane) as the Mall is on your first right - and there is not much time - with the space invaders style of driving.

2. Al Nasr
this is by Al Sadd - passing the Oman Airways offices (same side as your car) and taking that left - head straight down until you see the Jumbo Electronics showroom and then take the right. it is a tiny shop so don't expect some heavy signage to guide you.

3. the Centre
in the Bin Mahmoud area and opp a car showroom - forget which one

4. Al Hitmi (not sure about the area name)
coming from west bay and heading towards what I call bank street with two huge swords on that road. at the swords signal you will find a large sign saying [snowhite] when you take your left. you will find a r/a - go straight through and then again - through the next r/a - take a left and you will find it before the QP building

HtH