I stayed at Federico's for just about a month, and it has been an absolute wonderful experience. Federico and the team are great, friendly, helpful and have always replied within the hour to any of my questions. Due to unforeseen circumstances, I had to check out slightly later than anticipated, and they were very understanding and accommodating.
The flat itself is incredibly well located in Colegiales, near Belgrano and Palermo, with everything you need only a block or two away. The kitchen is one of the best-equipped kitchen I have seen for an air bnb and as I love cooking, this was a massive plus. Everything else worked perfectly, and there is a shared washing machine at the top of the building which is great for medium and long-term stays. Another big plus for me was the stunning view - if you enjoy urban settings (which I do ^^).