Gabriels apartment is wonderfully located in San Telmo. Very close to plaza dorrego, and many cool spots in San Telmo.
We had some issues with the apartment, but I think these affected us more as we were staying for a long period of time. Some of them got fixed, others not.
The apartment is spacious, but it has a little (and at times annoying) quirk, as the wall between the one bedroom and the living/dining room is only a half-wall, therefore privacy is not always available for whoever is sleeping there. The photo of the living rooms is also very deceiving, as it has a completely different furnishing in real life. The wifi was down for (what seemed like a long time), but Gabriel did manage to fix it, so for most of our stay, we had well-working wifi. The kitchen is tiny, and not very well equipped, but again, I think this affected us more because we stayed there for such a long time.
The apartment has a wonderful location, it is spacious and cheaper than most other accommodation. I would not recommend staying here for a longer period of time, but it is a great, cheap option for a short get-away to Buenos Aires.