Nice, clean place in a convenient area of the historic center city. We stayed in room 3 which was a corner room. The bed was super comfortable and bathroom clean and nice.
The staff was super helpful and friendly, offering suggestions on places to see and restaurants to consider. The breakfast area outside was lovely, and the food selections very good (they will cook softboiled eggs, too!).
We would certainly recommend The Duomo House for a stay in Napoli!