My wife and I and my parents-in-law spent four days here and would recommend it. It´s not a luxury hotel by any means and the rest of my party kept comparing it with the Sheraton in Buenos Aires which is fancy indeed. If you expect a "real" Sheraton then this is not it. I imagine it must be some kind of franchise.
Having said that, it suited us. The room was big and spacious and the staff were efficient and friendly.
The location is good for the old city although the surrounding area is delapidated and uninviting.