Danny was a wonderful host! My flight was delayed twice getting to Buenos Aires and Danny was very accommodating with my changing plans. When I arrived, Danny gave me wonderful advice on the neighborhood, where to get good coffee, food, transportation, etc. He made me feel very welcome and he was very responsive to communications.
The neighborhood is safe and quiet with lots of restaurants steps away.
The only cons would be that the unit is right next to the buildings elevator (tiny! max 2 people) and you can hear it going up and down sometimes. I stayed on a weekend (Friday and Saturday night) and some of the neighbors in the building were a bit loud until late at night (after midnight), but I was able to tune it out. It may not be a frequent issue though. The hot water runs out very fast in the shower too.
All in all, I would stay in the unit again if I visit BA because Danny was such a great host and the apartment was cozy.