If you're going to be working at the Hamad Hospital next to the Al Saad area then you'd be best to be housed in the TV roundabout area. If you're going to work at the OPD Annexe by the Museum (closer to the airport area), then the Mansoura area is best.
You will cross thru the centre of town otherwise, and traffic is now a major problem at peak periods which is from 7.00am to 2.30pm and again 4.00pm to 8.00pm.