Fernando is a very welcoming host. He helped us with the best way to the apartment from the airport. He wasn't able to receive us, as our flight was delayed, but had one of his neighbours ready with the keys and checked up on us in person after a few days. He is attentive with responses through email and WhatsApp within the hour usually.
The apartment is central with San Telmo around the corner and the city centre and Puerto Madero a 5 min walk. The interior is grand with tall ceilings, windows and doors. The generous bedroom has the only external window, with the living room and entrance hall taking light from the buildings internal courtyard. The kitchen is small but has everything you need. The bathroom compensates for the small kitchen.
I would recommend this for people on medium to long stays, we stayed a month. There is some ambient noise but no more than one would expect in any city (although some of the ambient noise is tango music so maybe one would not expect it in 'any' city) . It is a great place for tourists trying to get the most out of Buenos Aires as it close to buses and the subway. We will definitely return here if our travels take us back to BA.