I filled up the gas and went to the store, but they insisted it wasn't full and charged me tens of euros!

Satisfactory

Pickup was very quick. The car was almost a brand new 208 diesel version. Every small scratch was confirmed (and I took photos myself). The pickup point was quite tight and on a slope, making it a bit difficult to drive out, but that's typical in European city centers. Drove 600 kilometers over 4 days and spent 46 euros on fuel. Returning the car was also quick, and there was no over-the-top inspection for scratches. Although the credit card authorization hasn't been lifted even after 10 days, the return slip says 'car ok', so it's not something to worry about.

Hertz very good

Staff is kind and helpful. It took only 5-10min to process.