My wife and I stayed for 6 weeks in Maria's apartment, and I have to say it was the best we lived in while in South America. Clean, fast WiFi, a kitchen that's actually great for cooking, and perfectly placed to enjoy Palermo but also have easy access to the rest of the city.
It felt like our tranquil home in the midst of an incredible city and we will definitely reach out to Maria again next time we come to Buenos Aires.