One of my favorite places in Naples is Castel dell’Ovo (Egg Castle). A former royal residence with two towers offering great views.
Getting there: Metro line 1 – alight at Municipio station. Location: Via Eldorado, 3. Opening: Monday to Saturday from 9:00hrs to 19:00hrs and Sunday from 09:00hrs to 13:00hrs. Fees: No fees chargeable. Visit Civitatis Naples at https://www.introducingnaples.com/castel-dell-ovo for updated information.
Anyone planning a budgeted trip to Naples, my suggestion is to live among the locals and find an accommodation within walking distance from the station. Plan ahead for longer stays to explore the city in a more relaxing way.