Great trip

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.

There were quite a few upsell attempts, but I declined all of them. I forgot to refuel the car before returning it, so I was charged a service fee, which was quite expensive! Remember to return the car with a full tank. For the first time, I was charged an emissions fee, and there was another fee that I didn't quite understand, which was also quite expensive. I booked a manual transmission car but was given an automatic one; the vehicle was brand new.

Make sure to navigate to Parking Rent Car T1

The rental store will try to make you change cars and pay for more expensive insurance. If you refuse, they will tell you that the car you want is no longer available, and the only car left requires an extra fee. The location for car exchange is not accurate and hard to find.

Car exceeded expectations, no VW polo on site so was given an upgrade

Short and sharp to rent a cheap car