We stayed three nights at Roberto's place amd we were very happy with it. The neighbourhood is not the best in Naples (too many trashes on the strest) , but that what's motivating us to back to the accommodation as soon as possible.
The appartement was clean and modern (you wouldnt expect it by judging only by the look of the building) with everything you need, hot water, air conditioner (we didnt use it because of winter). Recommended for those who stayed only one night or a couple of nights as it was only 5 minutes walk from the main station. We didnt meet Roberto, but Serena has welcomed us and gave us lots of restaurant recommendation. We could even check-in before 2pm. Roberto was also very helpful.