6 days later... First we assured it was the right spot to jump. Then Sten T gave it a try and after that it was clear it was good to go. Since the fall is around 18 meters, make sure you're in the right position when reaching the water. Otherwise it might hurt a bit but it's nothing much.
This place is amazing. We had a day trip on foot as the cars are not allowed there. You can hike along the trails between 5 villages or take a train. Don't forget to buy a ticket ;) We did forget and got fined... woops!
But the place is magical!