I stayed here with a friend for three months more or less, as we were here with an overseas programme. We found the apartment very nice and very well located. It is 100mts from the light-blue line of the metro that links the apartment with plaza de mayo (Casa Rosada) and the same distance from the stop of the autobus n.39, that links the apartment with a lot of different districts: it brings you to Av. Corrientes, where you can try local cuisine, to Av. Santa Fè, that is full of shops and restaurants, to the stilish Recoleta neighborhood, to the night life of Plaza Serrano and a lot of other useful and interesting places.
Someone may say that the location is not the safest one: it isn't Palermo for sure, and neither Recoleta, but we have never had any problem and we have never been scared from something.
Concerning the apartment, it is as it appears. It is very spacious and comfortable. The washing machine works very well (very useful for two boys) and we never had any problem of any sort. The host and all the family's members that we talked to are very kind and friendly.
The house was cleaned weekly (or every 10 days) by a maid, known by the host and trustworthy (she is a great person, very friendly and, above all, very competent).
I reccomend the apartment of Pilar to all of you!
Enjoy Buenos Aires, it is a magnificent city!