The Rancheria Santa Catalina was one of the best places we stayed in Argentina. We slept in the former slaves' quarters in a nice garden with little swimming pool. In the evening Sebastian and his friend Daniel prepared an excellent asado with a lot of meat, good wines and a warm atmosphere.
All this, next to the magnificent Jesuit monastery which is worthwhile to visit.
And if you like the quietness of the Sierra Chica, this is a place to stay a few nights.