We had a very good stay at Mario's apartment. It's centrally located, close to almost everything you need. The flat itself is small but cosy. Even though it's not air conditioned it doesn't get to warm since its located on the ground floor. You won't get any sunshine there, but it's perfect for a visit to Naples. Contact with Mario was really good as well and he even let us check in around 11.30 am since we had an early flight.