I had a nice stay at the place. I am originally from Buenos Aires (I live abroad now and was visiting friends), so I am familiar with this area, which is quiet, pretty, residential, and still close to all the cool/trendy spots. The apartment is nice, maybe a bit smaller than what it looks on the pictures. Having the swimming pool in the summer was nice, though it also meant that lots of kids would play loudly in the afternoon/evening (so it was a bit hard to relax during those hours). Apart from that, the apartment is very quiet. Access to the swimming pool was also limited during the beginning of my stay, since the access door was locked, and I didn't have a key. I had to ask a neighbor for a key and made a copy, so now that's solved. I would have expected the hosts to do that, to be honest.
There was another minor issue that I would have expected to be solved differently. The fridge broke during my stay, and I was left without one for three days. The hosts were very prompt in solving the issue (a repair man came the day before Christmas' Eve, but couldn't fix it, so the hosts ended up bringing a different fridge on Christmas ' Eve), but I still feel they should have offered a compensation (--I did have to eat outside all meals during those three days, and ended up spending a bit more money).
Besides that, everything was fine, but having gone back home to Buenos Aires several times now, I have stayed at better, slightly cheaper, places.