We stayed at Federico's apartment for about 10 days and we liked it because of a good location. There is a metro station just in 5 minutes on foot. Metro line gives an opportunity to visit all outstanding sightseeing. If you don't want to use public transport you can go to the beach on foot and it will take not more than 40 minutes (we did so). There are also lots of shops( supermarkets, groceries, clothes). Especially we loved grocery shop at the corner.
Speaking about the apartment I would say that it is really good. There is everything people need. It is not big but very lovely and clean. We liked the entrance of the apartment that leads directly to the street what I find very unusual :)
We would definitely recommend this apartment.