It was okay for a solo traveller in Napoli to stay for 1 night, and reasonably priced. It's also in a great location, near the heart of Napoli, and a 15 minute walk away from the train station.
However, it felt to me like it wasn't a place someone would stay. Things didn't feel intuitive to me, and the apartment didn't have a warm welcoming feel to it. It's also between the first and second floors, meaning that there is only 1 window in the main room, and even when I had that open the entire night, I still woke up feeling like I had breathed in dust and unclean air the entire night.
It was still okay for me to stay 1 night, but I'm not sure I'd recommend it for more than that. Note that the bed is a sofa bed as well. Hopefully with some recommendations I've made, I think it can be a really great place to stay in future with a few tweaks and upgrades.