We spent a week here and I can't say enough good things. The location of the building really made the Buenos Aires experience. It was fantastic being only 1.5 km from the colonial express ferry terminal. Walking, you are immediately at all the wonderful things to see in San Telmo from the Sunday fair, to the antique stores, to the historical buildings. The national history museum is 2 blocks away next to a huge park, there are tons of places to eat, buy groceries, get fresh fruit, (and fabulous helado across the street.) It was very easy taking a 20 minute Uber to Recoletta barrio, the cemetery, or 25 min to the EZE airport.
Mariano was incredibly helpful and accomodating when the wifi had temporary issues (not his fault,) the building felt safe and secure. The room was spacious, bed comfortable, kitchen stocked with all necessary cooking items. The only semi loud night was Sunday with the local drummers but ended after a short while.