I stayed in this apartment for twelve days, and found it quite pleasant. The area Palermo Soho is THE area to stay in Buenos Aires, central, safe, lots and lots of nice boutique stores and restaurants, cafes and nightlife. The apartment is really quiet at night, daytime you can hear the usual sounds from a residential building; a door slamming, someone talking in the corridor, a dog barking outside - but nothing that lasts more than a few seconds. I did not meet the hosts, but they called the minute I stepped inside and offered to show me around and bring me to good places to eat, I found that very nice. They had made their own guide book which I found very useful - wish other hosts could be that professional.
The WiFi was good, the TV I never watched so cannot tell, but there was also a sound system which I let run most of the time. The apartment is on the 8th and 9th floor away from the street, with a nice view and a good balcony. There is no sun on the balcony, but there is a terrace on the roof where you can have a tan if you so wish.
The furniture was simple, maybe even a bit outdated but I still say this is a nice place. It has everything you need, and the location is unbeatable. Enjoy your stay!