The apartment is very large and spacious. There is plenty of sleeping room and the beds were good. Francesco even offered options for arranging the beds for us. It worked well for us since we only stayed two nights and had just one evening in Naples. The next day we rented a car and saw Pompeii and Positano. (I highly recommend both) One note, there is no living room or sitting space, just bedrooms, bathrooms, and the kitchen.
The apartment is not in the nicest part of town and just a block or two away is not where you want to be at all. (It reminded us of the bad parts of Gotham City) But if you want a nice big apartment near Central Station, this is good for you. It is also right near the Metro. If you are seeing Naples, I'd say go straight to the Metro and toward the marina.
Francesco was awesome. He met us at Central Station and walked us to the apartment. Outside he even said "It's better inside." The lift costs 10 cents, which he provided. There were some small things for breakfast in the apartment, yogurt, oranges, packaged croissants, milk and juice. He even left us a few coins for the lift. Francesco is very friendly and helpful, a pleasure to have as a host.