We had a great time in buenos aires last march, and surely staying at Señora Eyenit apartment helped us to achieve it.

For a fraction of what we would pay for a hotel room, we stayed in a lovely studio in a great neighborhood, walking distance to palermo's restaurants, bars and plazas.
The owner is a very welcoming, nice and sweet elder lady, and it was a pleasure to de-rust our spanish talking to her when we arrived.
My wife and I highly recommend staying there. Building and apartment are brand new, amenities are great and location can't be beat.