Sergio's place was nice and just as described. It was close to a lot of restaurants and bars. We didn't have a good time staying at Sergio's place mainly because of the constant power outages. Buenos Aires was experiencing a heat wave the week we were there (Jan 20 - Jan 28). The building didn't have a generator. So when the power goes, so does the A/C. Other neighborhoods weren't affected by the power outages (probably because the buildings had power generators). So although the place was nice, our experience was less than perfect. We had a miserable time because the power would go out for more than 2 hrs each day, with one day the power was out for more than 8 hours. Imagine being tired after a long day exploring and coming home to a place without power or A/C.

Overall because of the power issues and no generator present, I'd recommend staying in Palermo Soho or at a hotel. I only recommend Soho because there are more shops and restaurants in the area. I understand that our experience is different from the other guests. Had we not had power issues, I'd highly recommend Sergio's place.