Excellent experience. The apartment was impeccable and the WiFi connection worked great . Claudia was very easy to reach at all times and she replied very quickly to my booking request. The building manager Yolanda and her son Mesías were available for help as well, and the building seems pretty safe: you open the street gate with a key, the building door with a personal security code, and then your apartment with another key.
The location and neighborhood are excellent: walking distance to Palermo Viejo, subway on Ave Corrientes, and if you like dancing tango, it's close to several great milongas: La Viruta, Salón Canning, Villa Malcolm, and Milonga 10.
I will definitely come back next time I go to Buenos Aires.