Karla's apartment is well located, the subway station is right at the door and the neighborhood is safe and clean. The two highlights are the really comfortable bed and the amazing shower; the apartment itself is modern, with nice design choices and new furnitures, also it has an airy feel as it is a big studio.
The wireless internet connection provided is stable and fast, the lights create a cozy environment and the view from the balcony of the avenue is great.
The reception has some really nice doormen, specially the guy from the night shift that even tried to speak in Portuguese; the rooftop has one of the best views from Buenos Aires and the sunset from there is awesome.
Karla was very attentive and helpful, she gave some local advices, answered a lot of questions that I did in the check in and it was very easy to get in touch with her prior and during my stay, she is surely a Superhost.
Two things to bear in mind: the apartment is located at an important avenue, so although the windows muffles the street sound, it is still possible to hear car horns and sirens, if you are very sensitive to noise during your sleep, keep it in mind. Also, the curtains are those blackout ones, but they are divided in 3, so a little bit of light can get in the apartment even with them fully closed, if you are very sensitive to light (a.k.a. loves a completely dark room), during the morning you will get some indirect luminosity, but nothing disturbing.