I found the appartment as described in the Airbnb- Advertisement. Check-in and Check-out was flexible and went smooth. Host helped with all practical information needed. Location is near Entre Rios and therefore with lot bus connection in all directions. Concerning Tango the appartment is within walking distance to Obelisco Tango, Lo de Celia, Consagrados. El Beso and Gricel is a short bus ride away. So, very practical.
I was caught by an eletricity problem one day, which might be quite normal for BsAs in high summer. The A/C had sometimes a very hard fight with the argentine summer. A closet in one corner could be useful.
On departure day I had to delay my departure several hours, host was very kind and I was able to stay as long was needed.