Honestly, it's just average.

Very good

In Zurich, Switzerland, I booked a Golf online, but when I got to the store they told me it wasn't available, so they gave me a Ford instead. The two cars are about the same class, so it's okay. Communication with the staff was fine. I added a GPS for an extra charge, which was a bit annoying. The online rental price was over 500 RMB for three days, but the card pre-authorization showed an amount of 2637.30 RMB. Even with the GPS, it shouldn't be that much (3 days * 600 = 1800 RMB, is the GPS cost over 800 RMB for 3 days?). I have to wait until I return to check the actual charge. Later, I had to change the drop-off location, and when I called, the staff agreed very readily without any extra charge.

I originally booked an Opel Meriva but it was unavailable. They upgraded me to a Mercedes GLK for free!

Ask for upgrade and was turned down. The customer next to me was given a upgrade without he asking. The car had minimum level of windscreen washer fluid. Had a a hard time to drive in winter n snow without washer fluid. Bought my own windscreen washer fluid to top up and use for my driving in winter snow. Avis disappointed me.