I stayed nearly 4 months at Alejandros loft. I highly recommend staying there. It is located in the safe district Belgrano. It is connected to the subway and all buses. And the flat really looks like on the pictures! I felt very comfortable. Alejandro speaks Engish, Spanish and German, so it was very easy to communicate with him. And he gave me lots of advices to have a nice start in Baires. His lovely parents gave me the keys and showed me around the city.
I really enjoyed my time there.