Oh, this is weird and interesting:

Quote Originally Posted by Belarussian booking service
В санатории Белая Русь одноместные номера бронируются только для сотрудников предприятия-собственника (Министерство МВД РБ). Забронировать для Вас одноместный однокомнатный номер не сможем.
Despite the fact that I am already paying triple the price of local people and willing to pay more, I still cannot book the better room... Hm!

And who are "Министерство МВД РБ"?
Is it the Ministry for Interior Affairs by any chance?
Hopefully there is no overzealous visa registration officer holidaying there!
(I had not realised this was some kind of corporately run establishment - I thought it was just like a budget spa that is open for anyone... )

Anyway, this place is located in a nature reserve, at an isthmus between two famous lakes, in the middle of a pine and birch forest. Bliss!!! It also has a VERY large pool and a great gym.