We visited the wonderful Posillipo in our friend group of 5. The size of the apartment was perfect, with two large beds and one small one. The whole apartment was excellent: very clean, great interior, large windows and a very quite neighborhood - perfect for a nice relaxing time a little outside of the crowded old town of naples. Since there is a bus stop 5 minutes from the stay, its very easy to get into the city. But the more suburban flair of posillipo is definitely worth it. Some nice beaches are nearby also, great for swimming on hot afternoons.
Besides the the great apartment and location, Valentina was one of the best and kindes hosts i have ever had. She was reachable all the time and helped us with useful information about the city and day trips. She organized a transfer from the airport directly to the apartment and one day she even drove us to a restaurant on herself!
All in all, we had a very great time in Naples and we will definitely come back sometimes.