We booked this cruise due to the itinerary which included: France, Gibraltar, Morocco, Canary Islands, Portugal and Spain. The itinerary included 12 ports and 2 sea days.
We found little information on the internet (incl Cruise Critic and Trip Advisor) so we wondered what we had gotten ourselves into after booking this cruise. The Zenith is an older, and smaller ship, and we understood that English was not the first language. We could find only one (but favourable) review in Cruise Critic, and nothing in Trip Advisor.
We were pleasantly surprised with the ship, it's crew, and language did not pose a problem! The ship is older, but maintained in good condition, and although smaller than what we are used to (mostly Carnival line), we were able to enjoy ourselves (group of 6) in the cafe, the casino, the theatre, and of course "eating". Another bonus was the inclusion of beverages (alcoholic and non-alcoholic) in the price. There are extra charges for "premium" alcohol, but we were quite happy with what was served within the package price.
The room and balcony size is similar to what we found on Carnival. The cot converts from an oversized chair, and if pulled out, blocked access to the bathroom. Fortunately we did not require it's use, but it does use up a lot of cabin space. Bathroom was older but functional. The door to the balcony was excellent. It could be "locked" in an open state and did not bang around at all, which made it nice for sleeping with the door "open" if you wish. Lots of storage space.