This is a wonderful, old world apartment building with a wide marble staircase and a central elevator. We only needed the elevator coming and going with luggage. There is a doorman during the day, which is a nice touch. The apartment is full of light, especially in the wonderful, well-equipped kitchen, and offers the best entertainment value: the view onto Corso Umberto I, watching the flow of cars and motorcycles and pedestrians was fascinating. Giovanni has wisely left appliance operating instructions in a drawer in the kitchen, which is a big help.
Bedrooms are big and comfortable. We were just three people, so one bathroom wasn't an issue, but might be for a larger group.
Just to the left when you come out the front door is a shop run by the wonderful Alessandro. He has almost all the food items you will need for a short stay and can direct you to any store you need to get other things.
The apartment is not quiet due to its location on a major street, but we are from New York, so it wasn't really an issue for us. Maybe a 10-15 minute walk to Napoli Centrale train station, so convenient for coming/going/trips to Pompeii. Highly recommend.