Hi
Doha - Qatar is a moderate city , a lot of new buildings as they are on the same track like Dubai , The Governemt is spending a lot of money to change the city.
The Weather is hot most of the time but everywhere is air conditioned.
When I was there last March it was windy with a sand storm and the weather was really bad. Re investing in Qatar , during the Asia Olympic games which was held last year , the rentals went up more than 4 times and after the games were over prices didn't go down to the normal !!!!
I will try to update you if I remembered something else
Hisham