Here's some suggestions of Hotels and B&B close to the venue. More can be found on Booking.com
Hotels
NH Hotel Panorama via Medina (approx. 130€/night)
Hotel Royal Continental (approx. 180€/night)
Hotel Rex (approx. 200€/night)
Hotel Matilde (approx. 160€/night)
Partenope Relais (approx. 150€/night)
Relais sul Mare (approx. 140€/night)
Bed & Breakfast
B&B Daily Napoli (approx. 120€/night)
Bed No Breakfast AK 2 (approx. 100€/night)
Napoli Sea B&B (approx. 90€/night)
B&B Skyhouse Chiatamone (approx. 80€/night)
