We (5 adults) had an excellent 10-day stay at Margarita's place. Great location in Recoleta near most interesting sites and walking distance to good restaurants, coffee shops and everything you would need for a stay in Buenos Aires. The apartment is comfortable with all amenities, including for longer stays, accurate description. Definitely recommend Margarita's place. She was always attentive and flexible with our late check in, communication was easy with this gracious hostess.
Also, take advantage of the excellent transportation system in BA. We ride buses and subte everywhere with many lines and stops right outside the apartment, including bus 60 to Tigre --a day trip to this charming town in the Delta of Rio Plata is a must.