We traveled to Buenos Aires for 4 days - I had been there before and knew I wanted to stay in Palermo.
This apartment from Sergio was 5 stars across the board.. location, value, the balcony, amenities, everything. We had an absolute blast and really enjoyed our stay. He was very responsive and we stayed in contact the whole way.
If I'm going back to BA then I'm staying at Sergio's place again.