I have mixed feelings on my apartment rental which I will relate here. I have been to Buenos Aires about 10 - 12 times and know the city well. This is my first experience with Airbnb. Initial communication went well with the host Santiago. Fast replies to everything. He agreed to help me check in early which I really appreciated.
My Copa Flight got me into the city before 7am and I easily established communication and relayed that I would be there about 9:30. On arrival he was there and I waited no longer than 10 minutes.
The apartment was small, clean, and the location behind the Recoleta Cemetery was EXCELLENT. Nice bathroom, no trouble with hot water, or wifi. No noise from the bar next door as some have reported. Nice little kitchen area. Close to restaurants and attractions. Santiago gave some good recommendations for restaurants and activities. He also offered a Subte card for the subway and an electrical converter which everyone forgets.
There were some things I was not crazy about. First, no TV. Well.... There is a TV but no local channels, only Netflix. You have to turn on the TV from behind by hand and then a complex combination of pushed buttons on the remote gets you there.... usually. After the second day I never turned on the TV again. I did however get Netflix on my IPad.
One other thing is that there was no housekeeping. I was there 17 nights. No change of sheets or towels. You are also on your own for garbage disposal. One last thing. There is no safe.
In short, excellent location, friendly host. Some shortcomings for me. I would recommend, but for a shorter stay.