We enjoyed Carlos' apartment. It's spacious and quiet when close the doors and windows. It's conveniently located, close to shops and many attractions. We pretty much walked everywhere with occasionally taxi rides to further out neighborhoods eg La Boca.
Carlos and Brian were very responsive on Airbnb app to any questions, in excellent English.
The apartment is very airy which we love. It would be great if there are screens on windows and patio doors to block out bugs.
It would also be nicer to supply more essentials e.g. shampoo, TP, dish soap etc for the duration of our stay (11 nights). It's not a problem for us though. We just went to the store in the corner and bought them for a few USD.
Overall it's a great place to stay visiting BA. We would stay here again in our next visit.