Communication was perfect, Giovanni was very available and helpful, even booked for us a parking space for our stay in Naples (I chose the cheapest option, 20€/day, 20mn walk from the apartment - if you're travelling light, it's a pleasant walk - Giovanni can recommend a closer one if you prefer).
Big and clean apartment as expected, extremely well located. Perfect for 2 couples since each room has a shower room and wc, and they are on opposite sides of the kitchen/living/dining room, which gives privacy.
There is no phone network but there is wifi.
You can't see the street nor the sky, there is almost no natural light: the living room has a big window and the main bedroom has a little window (the 2nd room doesn't have any), but they are both on a tiny courtyard (the balcony is only an asset to smoke)
The advantage is that the apartment is silent, in a very noisy and lively area, so it's perfect for peaceful sleep.
I'd recommend it!