My wife, myself, and our dog stayed in Sergio's loft for 3 months. The loft was exactly what we were looking for - clean, safe, comfortable, close to our Spanish classes, a short walk to bars and nightlife, and just half a block from a great dog park/plaza.
Wifi - started out a little unreliable but midway through our stay Sergio and his team went through the building and replaced the whole system. Each apartment now has its own router and wifi repeater for the upper floor. The new system worked flawlessly for us.
The neighborhood, while in Recoleta and right close to Palermo, is more on the quiet side. For dinner/drinks or pretty much anything, we found ourselves walking a few blocks in either toward Palermo or toward Ave Santa Fe.
The downstairs security people were particularly nice and helpful, as was Roberto, the building manager. Glad we ran across Sergio's place, we had a great time here - hope you do too.