The apartment had a modern and comfortable design to it, making it extremely enjoyable for us. There is plenty of space in each bedroom which, mind you, has a king sized bed and a bunk bed, plus a functioning shower and toilet for each. The kitchen was small, albeit, it did the job well and everything one can expect in a kitchen was found there (be careful about confusing the salt and sugar though, we had salted espresso in the morning!).
The host (Giova) was also inviting and very polite, welcoming us to the home from the poor weather. Giova was also very helpful in our stay in Napoli, giving us a map and explaining what he saw as the best way to enjoy Napoli, showing us a nearby supermarket, restaurant(s), and nice tourist attractions for us to visit. He also explained how the metro and bus system worked. At one point, one of our suitcases broke, so we bought a new one from a nearby store, and gave the broken suitcase to Giova who happily disposed of it when we left.
The apartment was never cold, with good insulation and a functioning air conditioner. In addition, there were TVs in every bedroom and the living room (with Netflix too!). The wi-fi was fine and extended all the way to the corner of the bedroom without compromising any speed. There is a karaoke place below, but they do not play at night, so you can sleep soundly.
Overall, the stay was fantastic, and we really felt at home inside of another country. I would recommend this to groups of up to 8 (although in total, the bedrooms can host up to 12ish people, without considering the living room), and the rate was also incredible for the quality we were given. 5 stars out of 5 stars.