This has to be stated up front: The area that this flat is in is NOT THE MOST APPEALING. I was surprised at how run down much of Napoli is, and the area of this flat is an example of that. Me and my family were left in shock when we first arrived, just a short 3-min walk from the Terminale Central. I personally did not feel UNSAFE, but my two female companions admitted to this.
Despite all that, I would stay at Central House Napoli again. You CANNOT beat the location for getting around! It's steps from the Centrale,which takes you to Pompeii/Sorrento and everywhere in Napoli. There are many--MANY!!--eateries within 1-2 blocks, and despite its ugly look, it comes alive at nights and on the weekends. Some may be taken back from its lack of prettiness, but the area is actually fun and has many places to visit if you can look past its esthetics.
As for the actual flat; it's a GREAT PLACE! Almost everything is new, or very recent: kitchen, bathroom, lighting, windows, etc. We loved how much sun and breeze come in when you open the windows! Again, when you think about its neighborhood, walking into this flat is the polar opposite. We were in the Panoramic flat, 4th floor, great views. Definite 5-stars for the flat. The only negative about the flat is that it seems best for two people, or small family with 1 child. The living room gets very small when you open the sofa-bed, so three adults does feel cramped a bit.
Overall, I would still give this stay 5-stars despite its location.