Who knows the best way to travel from the Nice airport to the downtown Nice area of Old Town?
We were in Nice 2 years ago. We didn't arrive at the airport but left from there. Our hotel arranged for a taxi to the airport for us and I'm sorry to say I don't remember what the fee was, but we both said at the time that we thought it was very reasonable. I would just make sure you confirm with the driver what the fee is before departing. Sorry I can't help you more. Have a great trip!
Please see my reply to your other post on this question.