We stayed at Eduardo's place in March 2018.
Eduardo (and his family) were incredibly accommodating and welcoming. They were friendly, attentive, and helpful (even booking a ride for us to the airport at the end of the trip).
The apartment is even better in person than it appears in the pictures (his mother designed it and has an incredible style). The air-conditioning worked well, the kitchen was well-appointed, and living furniture was comfortable.
And the location is perfect...surrounded by places to eat and close to all major subway lines. We were able to walk to many of the main attractions (Theater Colon, Casa Rosada, Florida Street, Obelisk...even San Telmo when we felt energetic one day).
You won't be disappointed with the apartment or the owners.