Small, comfortable and perfectly formed apartment in stylish part of town, 10 to 15 minutes walk from the ferry port and airport bus terminus. Expect some traffic noise but the "gradoni" immediately below your typically Naples balcony window is access-only for traffic. I slept very well.
There is a grocer and general store seconds from the apartment. Don't miss Don Maccarone's restaurant a few doors down. The owners is taciturn to say the least but the food is excellent and very good value.
Gennaro is a wonderful and generous host who was always quick to reply. At his suggestion, the lovely Mrs Gianni across the road took care of our bags after check out so we could continue enjoying Napoli before a late flight home.
Airport taxi was E25 from Piazza Carolina, five minutes' away off Via Chiaia.
Altogether highly recommended.