In reply to Sd00148:
Hi there I live down the road from Ailefroide 20 mins, as many have answered about rope i wont go over that,
i would go for the guidebook Briancon climb by JJ it is the newest version of the guide that covers all the sports cragging single and multi pitch in the area of the durance valley 3300 routes (about and hours drive from end to end) and include's nearly all of Ailefroide I think it can be brought from needle sports, this gives you options if the conditions are not great in Ailefroide.
most of Ailefroide will be shut the bars shops etc, there is a little snack bar/tea place that is run by a very cool old couple and they try and stay open all year, even when you have to ski tour in you can some times get a drink.
vallouise is 15 mins by car from Ailefroide, has a camp site (not sure when it opens) and lots of apartments, it will still be quite but the shops will be open and one bar/restaurant, like you said the end of May is the start of the kayak season, but only for the English, most start in june, and the summer season July.
depending on the winter season in may there can still be banks of snow at the bottom of routes in Ailefroide, we have not had great snow this year and i think you will be fine, but its still snowing here so just to be aware,
if you have any questions I am happy to help you can drop me a email at rob@dream-trails.com
cheers Rob