I recently spent 10 nights at Federico's place and had a great experience. It is in a very safe location (across the street from a Presidential Candidate), and was only a short walk to my Son's residence in Saavedra. The building itself is very secure and there is an elevator that leads right to the apartment on the second floor.
It had everything as described - Flat screen TV with Chromecast, nice firm bed, A/C & heat (was cold several nights during my stay), incredible water pressure for shower.
I wouldn't hesitate to stay there on my next visit to Buenos Aires. Thank you Federico!