We stayed in the apartment during 13 days, and we really felt comfortable. It´s very well located, in one of the best neighborhood of Buenos Aires (especially if you want to enjoy the bars, restaurants and theatres of the zone). The underground (subte) is 15 minutes walking, but there are a lot of buses near the apartment, so you can easily travel to the center, San Telmo and the rest of the city.
The communication with Sofia and Juan (her father in law) was amazing; it was a pleasure talk with them.
We will repeat it!!