I will post here our impressions of the city, as well as some things we learned.
For instance, on the airport terminal we could not withdraw money from any cash machine! According to the lady from Bank of Argentina "These machines do not recognize cards with chip".
Luckily, we had brought some €€ with us and exchanged them for argentine pesos. - Lesson confirmed: always bring cash with you!
In B.s. A.s. (Buenos Aires) we stayed at an airbnb place, which was great, as it allowed us to have our own place with balcony, kitchen and bathroom (and enjoy mate! - click for more information)
In each of them you could see the social differences, for example on the first day we went to La Boca. Directly when descending the bus some locals advised us not to leave the "El Caminito" area, as the area around is dangerous for tourists!
This part of town was where the wealthiest used to live, up to the beginning of the XXth century, when the yellow fever sent them to the north area of the city (Recoleta).
The mansions were then converted to "Conventillo", where different immigrant families shared the same place.
Nowadays it is very bohemian and it is in recovery.