We had an excellent stay at Diego's apartment. The location couldn't be better - we were able to walk or take the subway pretty much anywhere we wanted to go. The apartment itself is very well-equipped for long stays, with comfortable beds, a full kitchen, and a washing machine. My only note would be that it's hard to completely block out the noise from Avenida Corrientes (about .5 block away), so light sleepers may want to take that into account.