My partner and I stayed at Cristina's flat for 3 nights. We never met Cristina - check in was done through her mother, Linda, who was very helpful and friendly and spoke very good English.
The flat was quite big and comfortable us as a couple. The kitchen was well equipped with coffee, tea, and beverages were provided in the full sized fridge. There was also a full induction cook top and pots/pans - everything that one would need to make a meal in.
As others have said, the apartment is in a very vibrant area, and big crowds and noisy bars comes with the territory.
Linda recommended the trattoria downstairs, Nennella, which was great. We also went to Pizzeria 400 Gradi (around the corner) a few times for classic Napolitan pizza.
Overall, it was a great stay and I wouldn't hesitate to stay here again!