Fernando's studio was as advertised. The building is new and well located. It is close to the subway, to a large mall and lots of coffee places/restaurans, pharmacies and small grocery stores. The apartment was clean and well maintained. The communication with Fernando was very smooth and his handyman, Andres, was also very helpful and prompt.
The only down side is that the studio does not have Internet, but you can get a sim card for $1 and spend around $0.30 a day to have it on your phone (in dollars). Internet connection is also possible in pretty much all cafes and restaurants, so in the end that was not a problem.
The building does not have a doorman, but it felt safe.
I was in BA for tango dancing and the studio was quite convenient since it is only a couple of blocks from DNI and a 20 min walk to many of the milongas, so you can walk or take a cab for about 5 dollars.