Picking up the car went smoothly and was convenient. It wasn't in the city but in the west of town among a bunch of car dealerships. We asked some local people for directions.

I booked a Volkswagen but ended up with an Opel after some hassle. The car's built-in GPS was very useful. Germany is really great for road trips; driving at 180 km/h felt effortless.

Enterprise is very convenient as their station is the first one right outside Terminal 2. I rented a Passat but they upgraded me to a fairly new Mercedes. Returning the car was also easy at Terminal 1, as there are service desks at both terminals. You can take the elevator to the departure level after returning the car. The only downside is that the staff speak English too quickly and keep trying to sell insurance and GPS rentals, even though the cars are usually equipped with it. Renting a car is quite necessary when traveling in Germany.

easy to find and was upgraded, smooth service

nothing to complain

The car had a scratch on the bumper that was not documented in the rental contract, which led to 1150 Euro damage charges upon return. I did not receive a vehicle from the booked class (4 door sports sedan) but an SUV.