It has been a few years since we rented a car in Europe
we began traveling in 1985, having a car waiting at the airport, and taking off...we were also lucky in that we never had any problems
we arranged our rental before arriving, always rented a standard transmission (way cheaper), and lately rented diesels (better mileage)
we always took CDW (collision damage waiver) which blocked out a part of our credit card to cover the unknown...expensive but needed
we were almost always upgraded to a better model
ALWAYS, after finding your car in the car park...inspect for dents, scratches, cleanliness and return to the rental office if you find anything wrong...what you don't find will be charged to your card
ALWAYS return the car with a full tank of gas...it is very expensive there and will be more so if you have them fill it...and there aren't many gas stations near the airports
I am 6' tall and fit into all of the cars I drove...on web sites, you can get an idea of what is offered and with a little research, can easily find a comparable car available here, and check it out
obey the traffic laws, don't speed (I once drove approx 400 miles from the south of France to Paris in 5 hours...do the math), they are even cracking down on speeding on the Autobahn..
watch the other drivers to learn the laws/practices in Euro countries...eg, there is no right turn on red...do not drive in the passing lane...their style is different and not necessarily worse than outs...forget cup-holder count...I don't remember a car with cup holders...they take driving serious there
I always enjoyed driving in Europe...from the byways of Austria, to the Alpine roads of Switzerland to the crowded Avenue des Champs-Élysées
here's a couple of links that might help
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bon journey
steve