Address: Via Guglielmo Melisurgo, 15, 80133 Napoli, Italy
From the airport I recommend taking the bus it is 4 Euro per person if you get the ticket on the bus and it should bring you very close to the Hostel in about 30 min (depending on the time of the day). Follow the sines for Alibus and stop when you see this type of arrow (right picture).
For the taxi it should cost you 19 Euro if you ask for the fixed rate, but this will not always work out.
you have a bar, from where you can get drinks (example beer 0.33 - 2 Euro, water 0.5 - 1 Euro) and have some music, a common relaxation room right at reception and a kitchen you can always use & staff is available 24/7 (awesome, right?)