Just to add, while dropping my brother and his family to the airport, a bus passed by with "Qatar International Adventures" and so please find the link below

http://www.qia-qatar.com/index.asp

Qatar International Adventures
Qatar International Adventures Tel: +974 455 3954. Fax: +974 467 6184 e-mail: [email protected] P.O.Box: 13915 Doha, Qatar ...