This apartment is hands down one of your best options to stay in Buenos Aires. I stayed at Yanina's apartment for a month and I couldn't be happier. The place is perfect for one or two persons and it is just as it was described. The location is unbeatable. Steps away from the best night life in the city and surrounded by dozens of great restaurants and bars, but on a quiet street which makes it perfect whether you want to go out or just walk around the neighborhood. Subway station (subte) is about 10 minutes walking and finding a cab is never an issue.
The amenities at the apartment are just as described. In unit laundry and drier, heating system, flat TV (I connected my Apple TV and it works wonderfully) and everything I needed to feel like at home.
There was a person cleaning every week which was very convenient.
Whether you are staying for few days or for a longer period this apartment is a great option.
Yanina is a great host too. Always available to help and if she is not she always find someone who can help you.
Communication with her was great as well.