Our stay at Gustavo's studio in Recoleta was really nice. The district of BA called Recoleta is the best, the safest and the most beautiful one. Living there my friend and I were feeling comfy and did not have to think about any bad things we heard about the city concerning the safety. I can say that was indeed an awesome experience.
The apartment itself is 100% convenient and comfortable to stay. Very modern and cozy with all necessary things.
I would also like to add that Gustavo is a very nice host who is always ready to help with anything guests need and speaks perfect English (very rare in Buenos Aires).