A brand new Byzantine and Chinese based holistic spa, the staff provide 5-star service in every aspect of your experience.  I went for a one-niggt visit and experienced the sauna, steam room, polar plunge (brrr!) And the spherical pool.  The perimeter of the sphere has jet stations providing massages for the whole body.  I could only dream of a home shower that had as much pressure as the two in the pool.  
During my visit, I met a woman who was there for a 63-day weight loss visit.  In 15 days, she experienced a 15kg loss!
The village of mystra and the surrounding hills provide a breath-taking view from your private balcony.  
Robes, slippers and anything else you require are provided.  
We had breakfast and it was delicious, perfectly portioned meal with fresh ingredients and mullti-grained breads, along with local jams (fig, strawberry, and orange).
I plan a multi-day return.  Maybe a detox program that they offer.