Highly recommend Fernando's apartment. It was the perfect size for 2 people. It was quiet since it is not facing cordoba avenue. Fernando was very quick to respond and helpful. I didn't love the neighbors, but we didn't communicate very frequently and it didn't detract from the stay.
The wifi was great, the hot water was great also. The bedroom was very quite and got completely dark. The bathroom was in the middle of the living room, which is not the best for entertaining guests, but if you want to have guests over, you can reserve the room on the terrace of the building that comes with a great grill and it's own bathroom and the view of the city. I think this apartment is one of the better value offerings in Palermo. I would stay again.