I would give this 10 stars!!
The unit was exactly as described. The location near Puerto Madero is ideal. The hosts were very accommodating. We arrived very very late, and they made sure that we were able to check in easily.
They provided a bonus for us, which was coffee at a café around the corner. They even helped us store our luggage after check out and before our international flight.
The next time I return to Buenos Aires, I will stay in the same location