I would rate it 70 out of 100.

Very good

Avis is considered a high-end rental company, there’s nothing to criticize.

The car model we booked was not available at all. When we showed the contract to the staff, they didn't care and said that the model in the contract was unavailable. We had to either accept the available model or not rent at all. Since it was midnight, could we really not rent? We ended up reluctantly accepting a smaller model. The trunk could only fit three suitcases, and we had to place another suitcase on the back seat, making the back seat extremely cramped. The journey was very uncomfortable!

Despite booking over a week previously so that Avis would have plenty of time to set things up, when we arrived they did not have our car ready (Merc E Class) and did not have anything comparable to offer. After calling their associates, the only available alternatives were a monstrous Merc G Wagon (imagine trying to park that in the land of the Fiat 500) for more money, or a BMW 3 Series Touring. We took the BMW. Then we were informed that the insurance that we'd already paid for via Easyrentcars would not offer adequate cover, and for fully comprehensive cover we had to book with Avis. Given that we'd already had a car damaged in a car park in Italy on a previous trip, we felt that we had no option but to comply with Avis' advice.