Lucia's place is better (and bigger) than I expected. I visited in winter (December), and I really appreciated how warm and comfortable the place was. I found everything I needed, and the pictures are totally accurate. The decor is a bit kitschy but cute, and the beds are very comfortable.
The actual apartment aside, Lucia and her husband are amazing hosts -- endlessly available for anything you need and extremely responsive when you have questions. I couldn't find a wine bottle opener and literally before I could write "That's OK, don't worry about it," I heard the doorbell ring and one was being delivered. Lucia is happy to be as involved in your stay as you like, and has a lot of advice about the neighbourhood.
About the neighbourhood, it's ideally situated. Within 10 minutes walking, you can find amazing pizza, half a dozen awesome and inexpensive pastry shops, renowned eateries like Di Matteo and Sorbillo, and a range of museums, notable churches, cloisters, and entrances to Napoli's underground. It's about 20 mins walking from the central station, so that is a bit of a hike, but not at all unmanageable. There are also a number of nice bars very nearby.
I definitely recommend anyone to stay here. It's a very good value.