I stayed here for 31 nights (Jun-Jul 2014) and these are my thoughts:

Absolutely amazing location. The apartment is in Palermo Soho, very close to the Palermo subte (metro) stop. Great restaurants (Hernan Gipponi, Don Julio, Unik, etc.) are all within walking distance. Palermo Viejo, the best shopping district in the city, is less than a mile away. Nightlife like boliches (Kika etc.), bars (Sugar, Temple, La Princesa etc), and Plaza Serrano, are also less than a mile away. Palermo Soho is extremely safe. I loved Palermo and can't wait to get the chance to come back.

The apartment itself feels a little old and the second room is small, but for the price and location, it is unbeatable.

Carlos is extremely helpful and always just a phone call away. I definitely recommend this apartment to anybody interested in staying in Buenos Aires for a while.