This is a lovely, spacious apartment in a great location. Plenty of space for four of us ( 2 adults and 2 teens) and in fact six would be fine using the sofa bed. The interior is spotlessly clean, comfortable and modern. We also appreciated being in a building which was genuinely part of Napoli's Centro Storico - the best of both worlds! I would just mention that access to the bathroom from the mezzanine bedroom is via the downstairs bedroom. This wasn't a problem for us, but is something to be aware of. The apartment is centrally located and stepping outside the door you're in the midst of the Centro Storico and can explore the whole of Naples. It's also less than 5 minutes walk from Toledo metro, from where there's good access to all the places of interest in the region-Pompei, Ercolano, Vesuvius, Sorrento etc. For a beach day I highly recommend Baia delle Rocce Verde at Posillipo- 25 mins by taxi.
Finally, Nicoletta is a perfect host. Attentive, informative and responsive but not intrusive. Would definitely recommend and use again.