Antonio met us at the apartment and was incredibly cordial, even though we were a bit late because our Uber driver got a bit lost.
The apartment was updated and very clean, with a nice little kitchen, a nice "master" bedroom and two more cozy bedrooms. The location was very central, and as others have noted, there is a bit of street noise, but that's to be expected in a city-center. (And Antonio kindly provided earplugs in each bedroom). It was a short walk to the Bella Vista district with some amazing restaurants.
Overall, I would rate Antonio's place as excellent, with some small quirks: the building seemed a bit tired (the elevator seemed to be on the fritz), and initially finding the building was a little difficult (we ended up asking a police officer for directions).
I would certainly recommend this AirBnB to others, but mostly to a younger crowd that wants central nightlife and doesn't mind the noise.