We stayed at Gustavo's place for 6 nights and had a wonderful time!
The apartment is very well located, tucked in a one-way quiet street in Recoleta neighborhood, within a short walking distance to the neighborhoods main attractions. The building is new, with a secured entrance lobby and the apartment itself is neatly designed and organized, with a lovely balcony facing the street. The apartment was warm and cozy, and came with the essentials, such as clean towels and sheets; although the kitchen came fully equipped, it did not come complete with the basics such as water, milk, coffee, tea, sugar, salt, pepper and olive oil which we needed to provide ourselves. It was no big deal for us, as there was a cute coffee place just around the corner for us to start the day at, and spent most of our days touring the city and eating out, besides, there's a small supermarket just down the road to buy essentials. Also, the apartment is pretty bright with no dark curtains, which again, was fine with us, but those who'd like to sleep in would might like to pack a bedtime eye cover.
All in all we had a great stay and would definitely recommend anyone who's looking to stay in Buenos Aires's best neighborhoods, and would be more than happy to stay at Gustavo's place the next time we visit.