Looks like an ideal itinerary for me too. I am interested! I am a 63 year old, male, straight, CPA from the Chicago area. I have been on several cruises, but none to Europe. I really like your description - I too enjoy history and architectural marvels (I have been all over the world). We could tour together, or simply split to avoid the single supplement fee. I do not smoke or drink. Also, don't snorkel.
Please let me know if you are interested. You can reply here or to my email at VinodPuran@live.com