Javier's place is beautiful and I'd stay there again. Great location in Palermo within walking distance to so many things. Easy to find, great restaurants nearby. A small park outside the apartment that the terrace faces is alive with children, dogs, occasional musicians and a lively local atmosphere.
The days we were there were quite hot outside and the air conditioning worked beautifully throughout the apartment.
A few picky points: some of the place looked a bit worn. The carpets in some rooms need to be either cleaned or replaced, a few places need some fresh paint, and the door to the downstairs bathroom definitely needs to be replaced.
Very fast internet though the signal was not strong in the two back bedrooms.
Special thanks to Guille who did an amazing job welcoming us, showing us how everything works - there are lots of treats to explore, like automatic blinds, and giving us good recommendations in response to our request.