We spend two weeks in this B&B in Castellamara di Stabia. Very friendly and helpfull owners. Clean, close to the Circumvesuviana and metro. Breakfast is basic but okay. A good place to stay!
I would definitely advise anyone to stay in Castellamare and visit Pompeii, Naples or Sorrento from here. Castellamare has enough restaurants and it gives you a better feel of the italian daily life then touristic places like Pompeii/Sorrento or hectic places like Naples.