We stayed at Marcos 7 nights and had a very nice stay in Naples. The flat had everything we needed and it was really clean. The apartment is directly in the historic center, so we didn't had to walk a lot to see the nice sides of Naples . It's only 10 minutes by foot to the train station where we could easily take the train to ercolano, pompei and sorrento.
Because of the central location the apartment is quiet dark all day, the streets are really narrow so there comes not really light into the apartment. But it's no problem as you probably will spend most of the time outside. We would really recommend Marco and his apartment if you want to be in the middle of the city. Thank you Marco, for the great time!