Excellent flat. The car parking space is a real boon because parking in the surrounding area (and most of Madrid) is impossible. The car parking is in a sub basement and it is really tight. I would not want to try it with a large car.
The flat is very comfortable and well appointed. We did not use the outside area because of the weather but in summer it would be a real boon.
There is a Metro at the top of the road with access to Madrid centre. It was easy to find and use. There isn't direct access to the airport but it was not difficult.
We were met and made welcome by Wim who speaks excellent English and was very helpful, as he was both before and after our visit. We had some problems during our visit (unconnected) and his help and support was invaluable.
We certainly hope to go there again.