It was amazing ! Perfect to relax, take a step back and think
There's plenty of things to do, you can hang out with others, read a book, work online, look at waves all day long, go to the gym etc.
The real danger is eating too much, food at restaurants is unlimited, even at official table service you can order multiple mains, multiple desserts etc. they won't say anything
Something to take into account is that USA residents have different cruises prices, usually cheaper, the rest of the world usually has to pay more
I'd probably not recommend more than a week for a first canoe trip anyways.
Weather at sea can be considerably worse than coastal weather. Cruise ships are pretty stable and it's unlikely to be awful, but plenty of people do get seasick. I used to be a professional sailor and so obviously can't see what the fuss is about, but probably half the passengers I spoke to felt ill on at least one of the days, and a few people spent the entire ocean transit in bed. If you're prone to motion sickness take some medication with you.
The atmosphere is different to regular cruises. Typically less of a party and the clientele skew towards older and more independent travellers.
To answer your actual question - go to cruisemapper and seascanner and you'll find them easily enough. They're all over the world.
Modern ships built in the last 10 years have stabilizers. I've been in a big cruiseship without stabilizer before and it can indeed move a lot laterally up and down (in the directions orthogonal to the direction of the ship). So, for people afraid of that just research if the ship has stabilizers
The difficulty is finding good prices for a solo cabin. For a cabin of 2 it's even easier to find good prices for repositioning cruises
As the other said, there are more days at sea (less stopovers), and it can happen that some stopover port get cancelled (for example they cancelled my stop in the Azores because they didn't want to bother entering a big Atlantic storm, it was risky)
Their main target markets appear to be mennonites and uptight assholes.
Our stateroom also hadn’t been cleaned when we boarded, and they had problems with the black water system so several decks just stank of shit. Our balcony had a persistent leak above it, so we couldn’t use that either.
The tickets themselves weren’t that much, but then it’s about €1,000 for internet access, and they nickel and dime you on absolutely everything, while not allowing you to have the things you already paid for - our bill on departure was about €4,000.
Oh, and at disembarkation in Southampton they destroyed two of our suitcases, and told us to go cry harder - and then it’s a three hour wait for a taxi.
Honestly, the whole experience was pure crap.
Also, unlike cruise ships, the QMII is a bona fide ocean liner, capable of crossing the N. Atlantic even in winter storms.