You feel like being at home in this apartment. It's bigger than what I initially thought by the pictures and the bed is really comfortable.
We had a really good time there and Matias was a perfect host, really good communication and very friendly. He has provided us with two "sube" cards for subte and bus.
The apartment is close to San Telmo market, it has some subte and bus stations near it and you can easily walk to Plaza de Mayo.