I am very happy to have found Arturo's listing here! He was a very welcoming host, and is very knowledgeable about tourist attractions and cool, underground things you can do in Buenos Aires! He went out of his way to answer all my questions about the city and was also kind enough to lend me his "ecobici" card, giving me access to the city bikes all accross BsAs! (Not saying this should be expected of him, but I'm simply giving the example to show what kind of host he is!). I also ended up going out with him and some of his friends for a night out in the town! He seemed very flexible to be as involved or hands-off as his guest needs.
The apartment itself has a very interesting layout, and is within a building with a fascinating background; don't forget to ask Arturo about it! It goes hand-in-hand with Buenos Aires' history. The room is fairly small and cozy, exactly what I needed for a week in the city, mostly spent exploring it's neighbourhoods.
I highly recommend booking this apartment! :)