Charming, well worth the drive.
Super cute little bus! We ended up staying during a rainy weekend, and my tiny Prius C made it up and down the trail twice, albeit very slowly. Definitely bring a 4wd or high clearance vehicle if you can help it, because it wasn't easy. Definitely worth it though. Great view of the hills and mountains from every direction.
We didn't realize that there was a van/RV site on the lot as well, and that the outhouse was shared with it. Given the current circumstances, we were a little nervous since we could audibly hear our neighbors coughing, but we all kept our distance.
When we arrived, there was water available for us on the bus, as well as instructions for the appliances and outhouse. There was plenty of space on the bus to spread out(and I had two kids on a rainy weekend), and it's charmingly decorated. The host does have dogs that roam, and are friendly for the most part. One dog is a little more excitable than the other, and did spook my daughter.
We got plenty of exercise and beautiful views walking on the dirt road. Only 5 minutes from Madrid, which is magical if you've never been before.