Excellent place to stay: location is really good and safe. You will be at walking distance from Puerto Madero and also from San Telmo. The view from the studio is amazing. If you like roller skating, there are nice areas for that around Puerto madero on the other side of the 'river' and in the parks. The swimming pool was also a really good asset to cope with the 40°C!! we had last week.
I would definitely book the apartment again, and definitely recommend Romina as a Host, the communication with her was super easy.