Perfect location for the tourism in Buenos Aires. Only one block you can get to Avenida Santa Fe and also to 9 de Julio, both where you can take the buses to everywhere. The supermarket "Disco" is only 5 blocks (5- minute walk). Carmen is very kind, always taking care of you.
The apartment is just for two persons with good terrace, but maybe the shower booth is a bit small (I'm Japanese standard-size woman so no problem, though).
It's cozy, with good wifi. The only problem is the elevator, that is old and noizy when it works. If you are sensitive to noise and you wanna stay at the apartment for much time, you should think about it. But normally many tourists go out in day time, so I guess it is not a critical problem.