Hello sir.
I recommend you of these real estate companies that provide the best apartments in Doha.

Al-Fardan Gardens (Alhilal area - which is near Toyota)
http://www.alfardanrealestate.com/gardens.htm

Al-Emadi Enterprises villas (see on the left)
http://www.alemadi-co.com/index.htm

These are the only 2 really good ones I know. (and there is another one, but I forgot its name, I'll search and message you when I find out, but I am not sure if it's good or not, will check )

Good luck and welcome to Qatar :)