We had a great time at Carolina's Happy Green Olive's place. The apartment is very nicely renovated and decorated. It is conveniently located on Libertador which is 10 min distance walk from a subway stop, close to parks and the neighbourhood has many supermarkets, coffee shops...
Carolina had someone to welcome us at our early arrival 5am to give us the keys (we did pay for the night but still it might not be possible with every airbnb).
Just a little warning for light sleepers, it is on a very large avenue with traffic noise but it can work like a white noise sounds machine for some!
Anyway, we would go there again often if it was not that far from NYC!