Francesco's BnB is close to key attractions while also being affordable. The room is very spacious with a TV and multiple desks you can use for doing things on your laptop, iPad etc. I also found the bed to be quite comfortable. Francesco is friendly too, and was also great with arranging check-in / check-out and communicating.
If I had one issue, it would be that it does stay quite noisy in the Centro Storico until about midnight, but this is typical of Naples rather than specific to this Airbnb - so 5 stars nevertheless!