It’s a fantastic place to stay: very clean, very nice and great views of the harbour and Naples. It’s not too far from the historical centre: about 10 min in an Uber or 2 stations on the metro (or you can also walk, along the beach and past the castle).
Most importantly, the host’s communication and willingness to help w the issues if they arise (it is a boat after all) make this a fantastic experience. Highly recommend!