It was convenient to pick up the car following the signs at Frankfurt T1. I switched to a VW Golf DTI which was a bit more expensive but worth it. Drove up to 200 km/h, thrilling! Returning the car was a bit tricky with the GPS, easier to follow the airport signs, T1 arrival, then follow the car rental directions.

It was okay

Pretty good and very convenient

The car was fine, but the German lady at the rental office was extremely grumpy. Just arriving in a foreign country and not yet accustomed to the English environment, I was slow to respond, and she was incredibly impatient. She misread my order and I had to argue with her for over half an hour until another employee came and sorted out my order. Due to the additional half-hour, I was charged for an extra day of rental. I asked for a refund through the rental platform, and also disputed the charge with my credit card company. When neither route seemed to work, the rental company proactively refunded me for the extra day. Lifelong fan of this rental platform.

Pretty good.