My husband and I stayed at Juan's place for a month and we certainly enjoyed our stay at his home for many reasons. First and foremost, he is an AWESOME host. He went out of his way to make sure we got what we needed. He provided lots of recommendations for BA and helped us understand the exchange of money (for those who do not know about the black market in BA, please google), which gave us twice more money than we would have gotten from exchange places. He was always responsive and responded super fast!
The location is great. Perfect for exploring San Telmo (check out San Telmo Mercado) and within an easy stroll of Puerto Madero and Plaza de Mayo. There are people hanging out at the corner of the block where the house is pretty much all the time and they play music loud here and there, but I did not mind it at all because I love Latin music! There were some homeless people sleeping in the street as well, but they were harmless.
Juan's apartment is beautiful. It's in a historical building that has 20 feet high ceiling. If you are looking for something modern, this is not it. But when you open all the doors and feel the breeze coming through, that is truly priceless. The place has an amazing book collection, which is also beautiful. I could not read any of these since I do not speak or read Spanish, but they were pretty to look at (Juan lives in the place when the place is not rented out, which means the house has many of his belongings). Historical building means complicated keys. There were 4 keys that we had to learn and get used to (key to the building, key to the metal door, another key to the metal shutter, then the key to the entrance of the unit). They are beautiful, but not the most convenient when you have an Uber waiting for you outside. The place is equipped with an espresso machine, washer, and dishwasher, which are important appliances for me (but it does not have a dryer, which means you have to hang clothes to dry them).