Giovanni's place is located on a very busy street, 10mins walk from the Central Station (which is about 20mins by bus (4€) from the airport)The building itself is gorgeous, and the apartment is very large and spacious and would suit 2 couples very comfortably.
There is a large kitchen with wrap-around balconies where we spent our evenings drinking wine and watching the fabulous craziness on the streets down below. Across the street is Da Michele Pizzeria, made famous by Julia Roberts in Eat Prey Love- delicious pizza! Downstairs is a grey little wine shop / deli. 25mins walk to the ferry terminal as well. All in all a great place for a short or extended stay in Naples. Tip: if you're a light sleeper, bring earplugs! I slept very well like that.