We booked an inside cabin in the Yacht Club on the Meraviglia. The room was way too small: they sacrificed storage space for bathroom size and we ended up having little room to put our clothes and had to keep half of our stuff in the suitcases under the bed.
However, the Yacht Club experience itself was well worth it and we spent a lot of time there. The ease of getting on and off the ship, the service, and the restaurant were enough for us to agree that we'd only sail MSC in the Yacht Club, even if it meant only going on one cruise instead of two due to the price.
