I visited the site at Cividale del Friuli today and must say I was a little disappointed.  Maybe if I had visited additional sites included in this listing, I would have gained a deeper understanding into the inclusion of this town by UNESCO.  The included area in the town is small, comprising only the cathedral and the area immediately surrounding it.  The cathedral is nice, but nothing particularly special compared to others in northern Italy.  The main highlight is the Longobard Temple in the Monastery set behind the cathedral.  This is lovely but very small, and has a real sense of feeling special.  The problem being that for me at least, I failed to grasp the reason for it being so special.  The site didn't seem to have any detail on how this place fit into the wider listing.  

Nevertheless the town itself is lovely, a series of winding, narrow and cobbled streets with a picturesque bridge over the river offering great views of the town and cathedral.  I enjoyed my visit, but wished for more context.  I will try to visit other sites in the listing in the future in the hope of broadening my understanding.

Note that the monastery, and thus the temple, is closed over lunchtime (12-2pm in winter, 12-3pm in summer).  The entrance fee was EUR 4 per adult.