An exceptional experience.
Terrific location: off the main street of Buenos Aires, 3 min walk from two metro lines, 9 min walk from the central station, lots of shops, about 10 min walk from the closest 24/7 supermarket.
The host, Andrea, is very communicative, interactive, helpful, caring, generous, warm, and gracious.
The apartment is very modern, well-designed, clean, spacious, and well maintained. Very 19th century European-style. The bedroom he rents is rather small, there's one very comfortable double bed, but not much room to even open a suitcase. The two small closets are filled with his stuff too, so plan your stay carefully, or negotiate it with him.
The breakfast included is a minimalistic Italian meal - a glass of espresso with cookies. The rest of the kitchen is not allowed to be used, so I would also suggest communicating the detail with him. I made a trip to the closest supermarket to buy cereals, fish, veggies, milk, and more. The use of the fridge is likewise to be negotiated.
Overall, it was a pleasant experience, and we would definitely recommend the place for short stays in Milano center.