First approach would be their website

http://www.nhrc-qa.org

Second the address as posted on the net is as follows

Location: Salwa Road, close to the Qatar Tribune office and the Jeddah flyover

Also call/fax them
Tel: +974 4444012
Fax:+974 4444013

And last but not least a link on wikimapia

http://www.wikimapia.org/#lat=25.2782726&lon=51.5279549&z=18&l=0&m=b

Regards!!