We were very comfortable at the apartment. It is somewhat rustic but has a beach feel to it (in the heart of San Telmo!). There is a lot of light coming through the windows and the large outside deck, which we loved. The building is quite quirky and has little gardens with ferns and banana trees in surprising corners. We loved that.
The location is great (close to public transport of all sorts, bars, restaurants, you name it) and we were still able to experience regular Porteño life.
Emilio and Flavia were really good to us. Very friendly and laid back. When we had any issues they were promt to solve them and offered a lot of useful info. They even offer to organize transport to the airport for us before we asked. We felt pretty much at home.