You should look at living in a compound. Some compounds have apartment buildings.
Not sure about unfurnished prices. There aren't any unfurnished ones in compounds. Do a search of the forum.
Some used car dealers have Cayennes and you can try the dealer here for used ones. That's best till you arrive.
Primary schools, in addition to ASD you have DESS, Park House and Doha College. These are the ones with the best reputation/track record. There are others, again search the forum. Problem is the waiting lists.

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