So, in conclusion to my original post, now back in Italy:
Don't expect Minoan Lines to be anything like a normal channel ferry that we're used to. Everything works slowly, in Greek fashion and without the efficiency we have all become accustomed to. OK we didn't have a cabin because we're skinflints, but the journey was long and very tedious and a feet up day was required afterwards. Check in times of 2.30 am and 11pm (2 hours before sailing didn't help. Canteens open and close at unusual times.
Unloading was a manic free for all with vans and lorries down a ramp.
We certainly won't be doing the 25 hour Venice one again.
Returned to Ancona which was much better.
Captive audience canteen price of 15 euros for meat & chips. 3.5 coffee etc,
so must apply for a discount card online.
Greece was marvellous but you need to be an experienced wild camper,
do not go there expecting French aires... Loved it, just like France 30 years ago!