The apartment is good for few days, but it's more like a hotel than just an apartment.
The whole building is dedicate for rental with tourist. That's not a problem as there is enough space (you'll not see your neighbor a lot), but if you prefer a stay in a flat surrounding by Argentinian, prefer an other place in other parts of the city.

The area is quite safe and you'll be able to find many restaurants and bars. Plus you'll be in the heart of the administrative commercial and financial city and close to the subway.

The building has a great "jardin d'hiver" and a superb terrace.
The apartment is good with no special charm.