I really enjoyed the apartment in Belgrano. This location might be a little further from the center but there is everything you may need (lots of shops, bakeries, supermarket, Chinatown, Mitre train station, SUBTE station, ….)
Apartment is very new, spacious, separate bedroom, 2 TVs, very good WIFI.
I also enjoyed fully equipped CoWork office on the 9th floor.
Overall, definitely recommending this apartment and Gabriela as a host