This place is currently undergoing some sort of restoration, but probably at a slow pace, as there were no workers visible.
There are photos, how it looked before. It was completely demolished and a lot of work was done. But it is not enough yet - half of the place is closed for safety reasons, documentation center is closed too and the only information, you can get on boards is, how is are the restorations going, what is the intended state and how much it was damaged before. No relevant information on the history.
4* is the historical authenticity. If you are already in Nuremburg, dont miss it. If you plan to visit Nuremburg to see it, dont do that, you will be disappointed.