I highly recommend this place and Juan as a host. I stayed at his place for five nights and it was a great experience.

As for the host, Juan speak fluent English and that helped me a lot. He helped me to replace a lost credit card and gave me a lot of advice on the city.

As for the location and apartment: You can't beat this location in Palermo. It's right in the middle of a bunch of cool bars, cafes and shops. The apartment is just as advertised with great heating and air conditioning. One thing to note, there's no laundry service in the building (but there's a laundromat on the block) and the "gym" is only a few pieces of old equipment, so don't expect a Western type gym here. But, you're there to see the city anyways, right?

Overall, I highly recommend this place and the host.