We enjoyed our time spent in Naples. This apartment is in Quarter Spagnoli which is said to be a not-so-safe area at night, but we didn't have any issues, everyone was nice around us. Via Toledo is just a couple of minutes walk, everything can be reached in reasonable time (port, beach, bars, metro).
The apartment itself is on a ground floor of a flat, it has 2 pcs 30x30cm little window in the bathroom in total - which is fine if you just go to sleep there, but you cannot really make your clothes/towels dry completely (after showering / visiting the beach). The humidity is ~100% all the time and everything is moisty as a result.
Massimo was helpful and available, his tobacco shop is on the corner, so getting/giving back the keys went smoothly.