We loved our stay at Dimora Duomo! The location was super close to the historic center and only about a 20 minute walk to Napoli's train station and also to the port. There are also plenty of cafes and restaurants on the street outside the hotel. The room itself was modern, very clean, cozy beds, spacious and clean bathrooms, and we loved the balcony in our room. The service of the folks at the hotel was also great in terms of communication and support.
Bonus: We absolutely loved the breakfast and it was so nice to have it brought to our room every morning.