Amazing. The apartment was clean and comfortable, and very nicely appointed. The terrace is a lovely space to just sit and enjoy a glass of very good wine. There is a rooftop that provides a beautiful view of the city. There is a pool, though we never found the time to get in it.
Ezequiel was very communicative, friendly, and helpful on local pointers on getting by in Buenos Aires. He left us a subway fare card to use, along with coffee, tea, salt, olive oil, and other pantry basics to make life a little easier while we were there.
The area never felt unsafe to me. We never felt unsafe anywhere we went in BA, and we walked a LOT of places. The apartment itself is a short walk to many bars and restaurants, so we never lacked for someplace to go.
The apartment was just right for my wife and I, and I would highly recommend it, and Ezequiel, to anyone looking to have a fun stay in Buenos Aires.