Julio and María's place is great. Just around the corner from the A, and in a nice neighborhood with lots of restaurants and cafes.
The apartment is lovely, with a lot of Julio's artwork hanging on the walls, including the airbnb bedroom. They also have a great view of the city from the living room, since they're on the top floor of their building (one of those gorgeous, palatial Beaux-Art buildings that make uptown so lovely).
They are also very welcoming. Julio offered me delicious coffee, artisanal bread, and roasted sweet potatoes for breakfast.
Highly recommended!