The communication with Mariano was great - he was always fast to reply to any questions we had and was really helpful.
The location of the apartment was excellent, really, we couldn't have asked for a better neighbourhood. San Telmo was by far our favourite barrio in Buenos Aires and this apartment will put you in the middle of it all.
If you're a light sleeper then you may need earplugs as the noise from the traffic on the street below and from the lively Plaza Dorrego could be disturbing, so keep that in mind.
Also, the wifi doesn't quite reach the apartment so you will have to use it from the stairs inside the building.