What a fantastic place - I can not recommend it highly enough or Giusi who is the best host and will go out of her way to ensure you have a fantastic time in Naples.
The apartment is right in the beautiful old town only 5 mins walk to 3 of the best pizza restaurants and all that the old town has to offer (the free tour from Dante square I would recommend at 10.30am every day under the statue of Dante).
In terms of the apartment itself it was perfect for our needs - great bed, great shower and everything that we needed (including good hairdryer which is rare most places I go!), coffee/tea facilities, and more. There is nothing you will need that will not be there or Guisi will help you find it! She also gave me her number so that she could send me a list of her recommendations, sorted out a pick up from the airport and told me to call her anytime day or night if I needed anything.
Needless to say, I will be back!
Thanks again Guisi!x