Fabian was hands-down the best Airbnb host I've ever had, in any country. Incredibly helpful and communicative (you'll be staying in his old apartment, and he just lives across the street, so he's always available). He had tons of great recommendations for what to do in Palermo (believe him when he tells you that Don Julio is the place for steak). He checked in with us throughout our 9-day stay. He supplied us with water and Malbec. He went above and beyond what is normally expected of a host, not only making calls for us to help us arrange our transportation when we left but going out of his way to procure some local concert tickets for us beforehand, when we were unable to do so online. He was our inside man in Palermo, and we were lucky to have him.
As for his apartment, it was perfect for us. The location -- about halfway between the nearest metro stop and the beginnings of the busy parts of Palermo Soho -- was ideal. The furnishings were gorgeous and well-thought-out. The little kitchen was great. There were multiple places within the unit to camp out and have a drink or browse through guidebooks and make plans. The bed was comfortable. The closet was spacious. The AC was plentiful. The wi-fi was fast. The sound system was bumping. There was even Direct TV! It felt like a luxury hotel room — but even better because it felt like a home. I will long remember the time I spent swinging in the hammock, drinking fernet and listening to tango on the radio. Really, this was a dream stay.
I would only express one caveat, and it wasn't even an issue for us. The floating stairs leading up to the loft feel a little loose, and there's no guard rail on the open side of the staircase. If you have little kids, or a strong sense of vertigo, this place might be off-limits for you.
But if you're young and/or able-bodied, this place -- and its host -- make for an unforgettable experience in Buenos Aires.