A big second vote for http://www.Rivierabike.co.uk.
We went in the second week of July this year and the weather was perfect. Warm enough for t-shirts but not sweaty hot on the climbs.
They'll taylor the week to suit the group and wherever they take you its awesome, flat out no holds barred singletrack descending, rocky sections, exposed sections, steps and alley ways through quaint little villages, switchbacks, van up lifts or xc climbs, hour long descents, Italian coffee.....second everything Gingerflash said, deserted untouched trails...
6 course meals back at the hotel, with a bar across the road. Based in a proper countryside Italian village with friendly locals even if you can't manage any more than 'ciao'.
Trailaddiction are also good, but more ski lift orientated and the weather in Les Arc can be variable (snow in July...). Would also recommend Freeridespain if you want some serious rocky xc, up, down, along but it might be a bit hot in July.