We had a great stay in this apartment. It's part of the (extraordinary!) Faena hotel complex, but not actually a hotel room. So you get access to all the hotel amenities, which are good, and (best bit) without being treated like a second class citizen! Very helpful concierge (who all speak English, if that helps). Puerto Madero is a new, quiet area of BA - further away from Palermo (bars and restaurants) but there are lots of taxis and the quiet is very welcome after the busy city. Walking distance to San Telmo, which we enjoyed. Bridgitte was a great host - helpful and responsive. Definitely recommended.
We were in BA over New Year, and would not come back at that time of year again. Lots of things are shut over the NY period, and literally everything was shut in NYE itself.