The apartment was very clean. It's small and cozy which allows it to cool quickly with the air conditioner. They thought about everything we would need : blankets, pillows, breakfast that was sufficient for 5 days (coffee machine, juice, pastries, toasts, jams), wifi password and even a map of Napoli to help us through our stay.
The location is okay, the neighborhood is not very nice but it's close to many amenities including a metro station that used very often to visit places around Naples.
In summary, I highly recommend this place; it's really perfect and the hosts are very kind and responsive.