I rented Raffaella's flat together with a few colleagues, and our stay was absolutely great - the flat is huge, beautifully and elegantly furnitured, and perfectly clean and tidy. There is a large living room and three bedrooms, as indicated in the ad, and two separate bathrooms, where everything was perfectly tidy and comfortable as well. In addition, there is a large kitchen, and - the best thing of all - two balconies, from which you have a nice view over the city, and can have breakfast, or some wine in the evening. The flat is conveniently situated not far from Piazza del Plebiscito and the seafront (about a 5min walk), and you can also easily walk to the city centre, if you want to. The neighbourhood is nice, and we felt secure at all times (the building's entrance is located in a kind of courtyard, and there is a concierge for the apartment complex, which adds to the sense of security). It was also very quiet, and we didn't have any trouble whatsoever. If you want to get groceries or dinner, there is small shops and some nice restaurants in direct vicinity to the flat, and you can also find bigger supermarkets on the way to the seafront (or elsewhere). All in all, it therefore felt like we were in the middle of the city (while at the same in a quiet and safe place).
As to the host, I didn't meet Raffaella personally, because I arrived a day later than the others, but they told me she met them upon arriving, and was extremely friendly and helpful (even allowing us to take advantage of all the food and utilities that were in the flat)! She went out of her way to prepare everything nicely for us and make our stay as great as possible. She contacted me via airbnb beforehand with some questions, but I also communicated with her over whatsapp, and she responded very quickly, meaning that if there had been a problem, I'm sure she would have done her best to take care of it immediately.
In sum, this is a really wonderful place, and we are very happy we got to stay there! I'd certainly recommend it to everyone who'd like to spend some time in Naples, you'll likely not find a flat that is as beautiful, and a hostess who is as friendly and dedicated.