Had a fantastic stay at Gustavo's apartment. Its a beautiful new studio in a nice area in Recoleta (about 4 blocks to Avenida Santa Fe or Aguerro subte). There's even a craft beer store on the street behind! The building and apartment are quite new with nice furnishings and finishings. Fifth floor with a small patio to relax on. Not much of a view as you just look out to the buildings across the street but still pleasant.
Didn't get a chance to meet Gustavo but he was quite responsive leading up to the stay and his friend Roberto who looked after check in/out was great.