Titti's place is beyond the expectations, located right between Chiaia and Spanish Quarter. I do recommend walking to both as it actually is the best way to make a judgement about Napoli (about 40 mins walk but you'd enjoy every step of it due to the view/ colours, light, architecture. Loads of cafes, restaurants, take-away. Perfect Location, felt safe and had the chance to see the day-to-day life not from a tourist perspective. As a tip, to get to Vomero you can use M1 line to Quattro Giornate or take 180 from Maddalena station which is about 10 mins walk from the airport/ this will take you in about 25 mins maximum directly to the metro stop in Vomero. Fabulous location/ would only choose a different one if I'd be right next to the sea. Perfect apartment and quite ' cool' for a hot month of summer, nicely organised, very clean and with everything one might need for a short/ longer stay. Literally a stone's throw/ either by walking or by public transport from all places one needs to see when in town.
Napoli is not a city, Napoli has got its own soul, with all its flaws and qualities. In love with it!