We didn't actually stayed in Mary's apartment as she had some issue with plumbing, but I just wanted to share experience we had with her. She was really nice as this happened the day before we arrived, found us another apartment, which wasn't as nice as hers (according to photos) but it was on great location. She arranged for her parents to wait for us to introduce us to new host and help in communication, as this person didn't speak English. Mary was kind and helped with information and arranged taxi for us even we didn't stay at her place in the end. I hope next time in Napoli we will meet her and stay at her place.