We had a great stay in Marcos apartment. The location was very central in the old town with loads of restaurants and bars nearby. This was my favourite area to Naples so it location could not have been better. Very comfy big beds. The terrace was great with outdoor seating and a fab view of mount Vesuvius. Be aware there are a lot of stairs (5 flights) which was fine for us but perhaps not for some.
I would definitely stay again!