I don't think there will be a problem as no doubt there will be a huge police prescence at your drop off points. Also this square is a wash with taxis so its worth getting one if your hotel is not in view of the police...This area is most dangerous in the lead up to the match...the night before being the worst time....although 2 Bayern fans were attacked near the stadium on matchday. just be careful...but not paranoid...remember the Germans had a great time as did the liverpool fans...its just a few that were caught out in the wrong area...but most of you are now well aware of possible flashpoints and will act accordingly.
As an analogy...if you were going to Millwall you would take a drink at Waterloo or maybe Covent Garden...you wouldn't have a drink down The Old kent Road...You're all street savvy in England so you just gotta take this outlook to Napoli. Have a great time.
[youtube]http://www.youtube.com/watch?v=XYrjYDpHbTg[/youtube]