I'm hoping to catch one or two 'undergound' tours of Nuremberg. I was particularly looking at the Art Bunker tour and possibly the Tunnels and Secret Passages tour.

Has anyone done either of these tours and care to share their thoughts? I can't seem to find many reviews online, particularly for the latter.

In theory I am hoping to do both tours but should I want to see Albrecht Durer House, I may need to forego one of the tours.