Thanks for the good postings from the experienced folks here. Some followup questions:
* Can the cabin class be upgraded or downgraded, say from an outside to a veranda or inside cabin?
Yes, but at the latest price..which will be higher since you will be changing it later on. If it is after final payment, you will be able to upgrade, but not downgrade.
* Can lowest cost guarantee rooms be booked?
Yes you can book any category available, including a Cat 12. The 10% discount does not apply to this category.
* Is there a limit to the number of rooms and/or cruises that can be booked?
Yes, if there are 4 people traveling you can book 4 cruises. It is one cruise per person.