There is a special rate agreement with Hotel Viena for all the participants of Cosmosur VI, with special rates mentioned below for the duration of the congress. 

Please, if you make a reservation at this Hotel, let them know that you will attend to Cosmosur VI in order to maintain these rates.
They are expressed in Argentinian pesos per day, breakfast is included:
Single room:   $ 4100/day 
Double room: $ 5100/day
Triple room:    $ 7000/day

Contact info:
Webpage: http://hotelviena.com.ar/
Whatsapp: +54 9 351 5524389
Tel: +54 0351 4600909 
email: reserva@hotelviena.com.ar
Instagram: @hotelvienacba