Great location - Nuñez/Saavedra is residential and peaceful, but extremely well connected to central Buenos Aires by bus, subway and train. Buses are frequent all day long, and the subway D line is an easy 20 min walk away.
The apartment is clean, and has basic appliances for self-catering. There are plenty of cafés and restaurants in the area, as well as supermarkets, including a giant COTO on Cabildo.
The rooftop is lovely, the pool is small but well maintained, with great views across BA and to the river.
Hernán is a great host and will answer you very quickly if you need anything.