Loved our time at Jonathan's place! My girlfriend and I stayed for 4 nights on the tail end of a few weeks in South America. The apartment was a great jumping off point for exploring Buenos Aires. 5-10 minute walk from tons of restaurants, bars and cafes in Palermo Soho, and an easy Uber ride to many other neighborhoods.
The space was very clean and had everything we needed for the few days. Building has 24/7 security which is great. We were initially worried about noise as the apartment borders a busy-ish street, but it ended up not being an issue (would recommend earplugs though if you're a particularly light sleeper).
Jonathan was a great host, very responsive and quick to share recommendations when we asked. Would absolutely stay here again our next time in Buenos Aires!