Overall it's fine. The car's condition is average, and the air conditioning cools down too slowly.

Overall quite good. The store at Madrid Airport in T4 is easy to find. If you land in T4S, be sure to take the shuttle to T4 to find the store. I wandered around T4S for a while... When returning the car, make sure to go slowly. If you drive too fast and miss the entrance, you'll end up at the parking lot's toll booth. Once you're there, you can't go back and will need to take another lap around. The actual car return entrance is a small, inconspicuous opening on the right before the toll booth.

The pick-up and drop-off processes were smooth, and the fee explanations were clear.

I booked an economy (Corsa or similar), but was initially given a Fiat 500 (I had a total of 800 km to drive, hence did not want a micro), which I managed to avoid and was finally given a Toyota Yaris instead. The guy at the desk was very eagerly trying to sell me additional insurance, claiming that the all covering extra insurance I had (taken at the time of bookin; insurance by AXA) would be useless if something happened. The car was in a very poor condition with all corners scratched heavily, the front spoiler skirt almost falling off and a big dent/scratch extending from the passenger front door all the way to the back. Only 6 scratches were listed and as I felt being rushed out of the office I took photos/videos of all visible defects (later realized that I didn't even manage to spot all of these). At least managed to convince the guy at the parking-office (not at the counter) to come to check the car with me before taking off. Hesitantly he came and very briefly looked around the car and listed three additional defects on the paperwork. Was it someone with less experience with cars instead of me, none of those would have been listed. At least on returning the car I was verbally given an "all good", so hopefully, no further expenses will be claimed from me.

Car was not a seat Leon. It was an old peugeot 2008. It was the most underpowered car I have ever driven. Had to go up most hills in first.