We had a great stay in Florian apartment in November.
We enjoyed the flexible check in and out, the great rooftop and the kitchen with all that you need. Mateirdi district is an authentic napolitain area with it small streets so it can suprised at the beginning but it was safe, very quiet during the night and we appreciated the proximity of metro station (5 min by walk) or old city center (15 min by walk). We recommend this Airbnb !