Within walking distance from Napoli Central train station, however it is not the best neighborhood. The people who actually run the place do not speak English, so if you are not fluent in Italian it's kind of hit or miss communicating with them.
The room itself was wonderful: clean, neat, well-supplied with single use toiletries and necessary items for morning coffee, and provided a fantastic shower with great water pressure and plenty of hot water.
I highly recommend for a short stay in Naples.