I was with my boyfriend for six days in Buenos Aires and I will stay in this apartment next time, no doubt. To start off - Danny is the best host you'll have on airbnb as far as I'm concerned. We were late with our arrival and didn't notify him, yet he waited for us with no questions asked. Then he sat down with us, marked on the map everything that could possibly be of interest to us in Buenos Aires. He also set us up with a place for money exchange that you surely can't figure out on your own and got us a cab with a lower price than regular to the airport.
The apartment is beautiful and ideal for two persons. The location (which is probably the most important) is perfect, situated just at a right walking distance to all the places you'd want to see, plus just 5 min walk to the metro station on the central metro line (a beautiful walk, by the way, by the botanical garden). The apartment area is also wonderful with tiny local bistros, perfect for breakfast and an evening drink. For nights out and a bit of drinking, we would go to the hip area - Palermo Soho, which is a 15-20min walk from the apartment.
All in all, this apartment is my best airbnb experience so far and I would recommend it to everyone.