I’ve never been in the summer, but have ridden with people who have. Words of warning are: It’s seriously bloody hot there at that time of year. I’m amazed there arn’t more roadies around, it looks a great place to ride if that’s your thing.
1. AirBnB – there are plenty of options.
2. Uplifts – have look on the resort website, it lists all the official uplift providers. Everyone’s pricing is set by the resort, and if you are doing full days (if you arn’t filling a van, you will have others in your group) a guide is included in your 50 euros each price.
Generally you end up eating in Agritourismo style restaurants for lunch which means a lot of local food & wine, for not much money.
You can do single uplifts to certain spots (Rollercoster/NATO/etc) which are from memory 10 euros a pop, but IME the guided days are certainly worth it, as it can be a right pain linking trails together to get the best from the day.
Different uplift companies do different style uplifts, most are van & trailer, but you can do the freeride tours, backcountry days etc, which are landrovers & trailers, which tend to be a bit more remote, riding the lesser know trails.
3. Guides – see above.