I can absolutely recommend you to stay at Robertos place!
First of all you can expect a perfect and totally reliable support from Roberto and Connie. Connie waited for us already and explained us everything important. She gave us awesome advices and many important and delicious food and sightseeing tips.
Also, everything was perfectly clean and modern. I assume it was recently renovated.
The apartment is in the middle of the old city and literally surrounded by all the important attractions in Napoli. Everything is in walking distance. And still since the windows pointing towards the patio it is very quiet by night and you can sleep with open windows.
In the end I want to highlight Connies effort supporting us since the phone from my sister was stolen in the subway (BigWarning: we knew about the stealing stats and still it was stolen out of a pocket right next to her hand). But Connie and Roberto helped us as much as possible to translate and to deal with the situation.
To sum up, I can totally recommend you to stay at Robertos place.