Thanks for the heads up about the aft berth. At 6'1" it may be a little tight, but I can't imagine ruling out the boat over that unless it totally egregious and I have to sleep in the fetal position. A very generous forum member has already emailed me with an offer to let us visit their boat in Florida, so will hopefully get a chance to find out for myself very soon.
The only Santorin that I have ever stepped aboard, circa 2009 in Carriacou, was owned by a rather tall German couple. I believe the boat was named Cayenne. Unless I am totally mis-remembering the gentleman's stature, it would suggest that they found a way to make it work.
A much appreciated tip, either way.