Tonias place was by far the best AirB&B that we stayed at, fantastic accommodation with your own front door the room was spacious with modern fixings, a TV, kitchen, fridge, great toilet and a very comfy bed, good WiFi, and a very helpful host who picked us up at the local Metro to take us to⁶ the accommodation which is very local to restaurants and shops, great wee alleyways and a lot of history, we enjoyed Pompei and the underground city.... make sure you book both well in advance.
Pompei is easily accessed by train for a few euros. Tonia can advise.
PS Pompei is massive.