My stay at Melina's place was fantastic-- Melina is an amazing and incredibly hospitable host, who waited for me at the apartment to check me in early despite a 2+-hour flight delay, crazy wait times at immigration, and a lot of traffic getting into the city. The apartment's location is fantastic, right in the heart of Recoleta, the amenities make a self-sufficient stay entirely possible, and the thoughtful touches (like the breakfast basket and bottle of wine) make the place feel like your home away from home. Melina was also great about recommending things to do and places to eat even before I started my stay, and she was incredibly responsive.
Highly recommend her place if you find yourself in Buenos Aires!