I spent one month at Vivi apartment (my 4th stay in Naples but first at Vivi's). Localization of the apartment is perfect for tourists as well as people staying for proffessional travels. Vomero is considered to be one of the safest areas of Naples and it is true - I felt secure there (in the historical center it is not like that). Metro, 3 funiculare stations, various shops, restaurants and StElmo Castle are in 2-5 minutes walking distance. In less than 10 minutes you can be in a noisy historical center or in Chiaia (by funicolare). Apartment is renewed, clean and comfortable. For me alone it was perfect, up to 4 people can stay there without problem. The building is old but very well kept, clean, without any smells. Vivi is very helpfull and kind person. I am comming back soon for another month at Vivi apartment :)