My sugestion is go to Al Fanar, the spiral like building opposite to Souq Waqef, on Grand Hamad Street.

Location

http://maps.google.com/?ie=UTF8&hq=&hnear=Doha,+Ad+Dawhah,+Qatar&ll=25.2...

General Info

http://www.fanar.gov.qa/Index.aspx?AspxAutoDetectCookieSupport=1

Regards!!