I stayed for 2 weeks and can say location was perfect, you can walk everywhere, lovely Retiro Park and if it is rainy day museums are near, grocery stores just in the corner etc. Apartment was great,it felt like home. Apartment is very silent and I'm very light sleeper so take my word for this:) It is also very safe, 2 doors in ground floor with locks before you can enter to the stairway. Wifi worked perfectly which was important to me.
Overall I would recommend this with all my heart. If I have to say one tiny negative thing it is a tiny toilet but you can live with it if you are not 190cm tall:)