Serafina's place is amazing! It's in the most convenient location and she and her husband are amazing hosts. They have everything prepared for you: breakfast in the morning, pamphlets with information on what to do in Naples, and they clean the room while you are out. I couldn't ask for a better stay. They are a dream and the flat is so beautiful and nice :)
Her husband also called the taxi for me for my train in the morning. If you go to Naples, you have to stay here.