Antonio and his son Mario have been very helpful and communicative. Mario was already waiting for me in the apartment when I landed in Naples and met me outside when my taxi arrived. He kept in touch with me on WhatsApp before, during and after my stay, making sure everything was ok.
The apartment itself is a great place to stay. The location is excellent, very close to all the sights in old tows, but on a quiet side street away from all the noise. (To the extent that anything is ever quiet anywhere in Naples, of course.) The pictures are accurate, and the bed is comfortable. The washing machine in the bathroom works perfectly, and there is a small balcony where you can hang your laundry out to dry. The kitchen is very basically equipped, but you can make simple meals. The coffee machine makes pretty decent coffee, and the host even provided me with a huge box of coffee pods that was enough for mye entire stay.