Carlo's apartment is spacious, clean, quiet and in a great neighborhood. Everything you need is within a few blocks. The neighborhood is very clam and friendly, there is a large park nearby, a big supermarket, a Farmacity, banks, as well as several small vegetable stores, markets and butchers. If you are looking for bars and nightlife- Palermo Hollywood is a ten minute walk away and Palermo soho is just beyond that or you can take one of the many buses that are near the apartment to wherever you would like to go in the city. It is not in the middle of the tourist hustle and bustle, the area has much more of a local/ genuine feel of Buenos Aires.
Carlos is a great host who cares about his guests and responds ver quickly to questions and requests.
I highly recommend for long stays ( or short as well). If you really want to experience life in BA, this place is perfect.