Even if me and my friends don't like Buenos Aires very much (but we spent only two days there!), I must say that Lilian and her apartment are really perfect!
The apartment is very well placed in Palermo Soho, is very well furnished and it's really nice.
Palermo Soho is really enjoyable for the nightlife and is full of bar and restaurant.
Lilian is a fantstic host, she gave us lots of information and tips about the city, monuments, restaurant, local transport and... milongas and tango shows!
I definitely recommend this apartment for your stay in BA.