We loved this apartment and the Palermo area it is in. The apartment is modern with all of the mod-cons. Beautifully appointed with a full kitchen and beautiful bath, living area, and balconies (incl hot tub) overlooking the city.
Palermo is full of cool cafes and shops - you'd have to spend weeks or months just to try them all. Beyond Palermo we tended to walk everywhere, though we did catch Subte some days (beware that Subte stops at 11pm which is weird for a city where people don't eat dinner till 10 or 11 pm). Sergio was super helpful - emailing beforehand and answering all emails promptly. Although he wasn't in BA when we stayed, he arranged for a friend (Mariano) to meet us - he too was super helpful. They helped with exchanging USD both when we arrived as well as later in our stay. The apartment also has a laundry (if you don't want to use a service in the neighbourhood) - which was also great.. there is a mini-market a block away for necessities.

We can't recommend this apartment more highly!