This has been one of the worst airbnb experiences I've ever had and I've been to many places.
Main issue: unbearable heat in the apartment. there is a small air con in the bedroom but its completely seperated from the other rooms so spending time in the living room or the kitchen is like being in a steam bath.
Other issues: the apartment is old and needs maintenance. hot water comes and goes, pillows are hard as rocks, slow internet.
Communication with the host was also unpleasant. refused to cancel the reservation, refused to give out his phone number. claims his company handles more than a 100 properties so he cant be bothered communicating through Wp, though he will give out phone numbers of his associates in case you need to change money or a ride from the airport... ridiculous. I left after one night.
Do yourself a big favor and find a better option in Buenos Aires, there are plenty.