I’ve been contacted by a company in Argentina that claim to have six accessible cabins that adapted for wheelchair users on the ground floor. Unfortunately, the do not give any details about the facilities in the bathroom apart from saying that it is totally accessible. I will contact them to see if I can get more information about the bathrooms, including photographs.  

They also offer activities for disabled people including sports and excursions. They also have a medical team on site if any problems are experienced. 
 

Their webpage in English can be found at:
 www.proyectorotae.com.ar/index_eng.html