We have stayed in the house for 3 weeks. It's located in Palermo with most interesting parts of the neighborhood on walking distance. Buses can bring you in virtually every part of Buenos Aires, subway stations Bulnes and Medrano are somewhat further away, but still on walking distance.
We were welcomed heartely by Mariana, the current host. She and her husband really cared about us enjoying our stay. We ate with them, laughed with them, they gave us loads of tips and were the connection between the constant arriving and departing guests.
The house was clean and well maintenanced. The kitchen had almost anything you would need for preparing meals. The roof terrace and common room were simply amazing. We experienced some problems with the heater in our room and hot water, but the hosts quickly fixed them.
This house is suitable for those who are looking for a good mix between some privacy and socializing with the other inhabitants. We would like to return one day!