Emily really deserves super host tag.
I was 8 days in hostel, they are giving the efforts in everything. It's really clean, 24/7 available and you even don't need to try to find taxi to the airport, because they have van available anytime, great wifi connection, ground rules are normal and expected.
Only downside for accommodation is very noisy street below, but we can't do anything with that, because Naples is 24h alive city.
Really, all recommendations from my heart.