Definatley recommend staying here if you are visiting Napoli! Great value and great location.
We had a great stay in Napoli. We didn't actually get to meet Paola, but her brother Antonio and their mother (who lives at the unit, she was a lovely lady but doesn't speak any English) was there. They were both very friendly and welcoming, offering us cold water when we arrived. The unit is very close to the main Napoli train station, only a 5min walk which is excellent! The unit itself is very nice! The room we stayed in was large and had a comfortable bed, air conditioning and it's own balcony. We were served a continental breakfast in the morning, it consisted of packet croissants, fresh coffee (which was nice, no sugar needed), biscuits, cornflakes and juice. It isn't much, but it was nice to have an AirBNB stay that included breakfast as it is becoming a rarity.
The bathroom was clean and the shower good. Some other people staying at the time left quite a bit of water and hair on the floor, but there isn't much you can do about that when staying in a share place.
There are a few restaurants within 1-2min walk which do fairly good and reasonably priced food (€13 for pizza, pasta and a beer at one).
There aren't many sights to see in Napoli, but we never needed to get the metro there at all as everything is within walking distance (if you don't mind walking). If you haven't been to Napoli before, it is a crazy place! Nothing like Rome or Venice at all, so the unit is a lovely haven away from the craziness. Being so close to the train station, it would be a great place to base yourself while exploring nearby Vesuvius, Pompeii and Herculaneum. All accessible by the Circumvesuviana train, which is right next to the main station.