Zepher - we did our Greek cruise on Princess, but it was a 12 day cruise. I remember tha two years ago NCL had two 7 day cruises out of Venice, one that made mostly island ports and the other mostly mainland ports.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014, 2016
Sail Windjammer: Mandalay 2017
Star Clippers: Royal Clipper 2015