I visited this apartment with my daughter and teenage grandson, so the double and two single beds were ideal. Despite the shabby looking building we were greeted by the owners and shown the beautifully re-furbished, very safe third floor flat. They met us with a bowl of fruit, showed us how everything worked, told us where to find a gluten-free restaurant for my Coeliac grandson , and when through no fault of their own, the WiFi went down, worked tirelessly to get it working again. There were two Metro stations, useful shops and the Archaeological Museum very close by, and we could easily walk to the Historic Centre.
We recommend getting a Campania Artecard (bookable on line) as it saves money and makes life very easy!