The place is as beautiful as described. Julian received us, is a nice guy, easy to talk to and will explain you in meticulous detail how to use the apartment and facilities. It was very clean and well attented and Julian received us thankfully at a relatively late hour. The neighbours are so nice and happy to help. The ubication is perfect if you wanna go out in San Telmo, to the Milonga in independencia or to the Feria de San Telmo.
There were only some issues with the door locks on the last night. This is a common problem in Buenos Aires as forged spare keys don't function too well with the locks and old locks system are used everywhere in the city that wear off. So this is something you might encounter in other AirBnB's as well. Just make sure they had it fixed, and you'll have a most pleasant stay.