I stayed with the Hermanosis group for a weekend in February, at their Mallorca location. I am from The Netherlands and have had experiences with two retreats there too, but I can safely say my experience with Hermanosis was by far the best.
Pros: honoring the plant, shamans have true integrity, felt like a real family, created a safe space, true guidance during the ceremonies, good interpretations after each ceremony, secluded environment in nature, good healthy food.
Things that could be better (really small points though): at the Mallorca location there is only one toilet (for 20 people), because it was cold out in Feb we were all in a closed off space which became a bit stuffy with all the tobacco used during the ceremony 🙂
I would highly recommend this group if you are looking for a genuine ayahuasca ceremony.