We had to change our drop off from Gatwick to Heathrow do to the airline canceling our flight and then rebooking us to fly from Heathrow... Avis accomodated...but for an added fee. Since Avis has a car rental site at both airports, a no added fee to drop off at a different airport would have been appreciated - particularly as we had no control over the flight change... Other than that - we were quite happy with our experience with Avis.
The car was good and quite new. The counter was helpful.
The price was very much more expensive than what I have seen in Kayak advertised. Not value for money, should have reflected when I booked in Internet.