We had three wonderful days in Naples. The apartment is smack in the middle of town, but it's away from noise because it has a semi-private entrance. It's a 15-minute walk from the main train station from which you can take day trips to Mt Vesuvius, Pompeii and Herculaneum.
Maria and her husband left us some snacks for breakfast. The place was really clean, felt safe, nicely furnished, and offered enough towels and kitchen utensils. There is no wifi but there are plenty of places around that provide wifi. Also, it's around the corner from Gino Sorbillo, where pizza was born! I definitely recommend Casa Dodo for a unique Naples experience.