I've riden almost 250kms over the past four days and what a joy it's been. Yesterday I saw the same number of cyclists on my route as I did jet fighter aircraft overhead - two! I rode a 22km descent and only saw three moving cars and one lorry. The main hazards on the road are pine needles, horse chestnuts and the occasional pig, sheep and or cow.
There are downsides - if you like crowds there aren't any, there's little in the way of night life, it can get cool in the evenings and atop mountain passes, entertainment mainly has to be self made. For the cyclist you must be totally self sufficient as you should assume on your rides that you will have to feed and water yourself as well as be able to carry out running repairs. Personally I don't recognise these as downsides, just more reasons to be here now!
Post script - I've just been asked if bikes can be hired this time of year. Yes, Balagne Cycles are open in L'Île Rousse and have a good selection road, hybrid and mountain bikes available. They also have paddle boards which are great fun.