I've been in but it was years ago so that doesn't really help. I've found a link to some photos for you so that you know what you are looking for:-
tripadvisor.co.uk/LocationPhotos-g186240-d18…
Here are some reviews I found, some quite recent:-
http://maps.google.co.uk/maps/place?hl=en&safe=vss&um=1&ie=UTF-8&q=admiral+benbow,+penzance,+reviews&fb=1&gl=uk&hq=admiral+benbow,&hnear=Penzance,+Cornwall&cid=16343455994209072375&dtab=2&pcsi=16343455994209072375,1&ei=xyFRTIGoBYH60wTpuZyLBw&sa=X&oi=local_result&ct=result&resnum=1&ved=0CBwQqgUwAA
My friend went there for dinner last year and enjoyed it but I don't have the specifics.
Hope this helps.
Suzi