I went with my dad and stayed for 7 nights. I have to say the truth...the apartment is great and has some pretty good views. The location is very secure and everything is in walking distance (restaurants, supermarkets, drugstores). Marisa was amazing! She was waiting for us when we arrived and give us great advice about the city, we went to some restaurants she recommended and it was just as she said...delicious! Listen to her....believe me :) Another important thing is that she was always there to answer any question and help you, for example I had to go outside Buenos Aires and she find out how could I go...imagine that! I never asked her to do it...it was all her. A huge help...and many other things that made her the best.
This was the first time I used Airbnb and I was very pleased. If you are planning to go to Buenos Aires, stay here....seriously....I will reccommend it to all my friends.