I stayed in Gwenole’s apartment for 5 weeks and I really enjoyed the stay. The location of apartment is perfect - the neighborhood is among the best in the city, and is quiet enough. The major avenue with bus stops and subway station is 2 blocks away. You can find good restaurants 2-4 blocks away, and in 10 blocks you have Palermo Viejo which is a center of nightlife. Palermo parks are 10-15 minutes away by foot. Aeroparque airport is just 20 minutes away by car.
The building is very well maintained, and has a swimming pool and a terrace.
The apartment itself is quiet, spacious enough, and looks exactly as on the photos.
I would definitely recommend the apartment for a long stay in Buenos Aires.
Thanks much, Gwenole!