We stayed at Sonia's place for 3 nights together with my mom and 2 small children. We were welcomed by Sonia's mom Olga the day we arrived. She was very nice and helpful and eventhough she doesn't really speak english I still managed to understand what she meant. She showed me around and pointed the direction of the metro and supermarket from the apartment.
The building has 2 small elevators so if you have a stroller it won't fit. You need to fold it to be able to carry it to the 4th floor. The apartment was clean and the size was enough for the 4 of us. We were able to cook there too. The Metro was very close and there's a supermarket nearby. It's easy to take the public transport and if you love shopping Corso Buenos Aires is just a minute away. :)
Sonia is a great host. She replies very quickly when I have inquiries and I met her personally the day before our flight home. I highly recommend her place. ;)