Looking forward to your review, as we are on the October 4th cruise on Meraviglia.
As for YC interior, the upgrade would be it is in YC. The cabin is small, limited closet space and the bathroom / shower is relatively small. We were in the YC inter in January out of Cape Canaveral, and it is doable for us, as we don’t tend to stay in the cabin a lot. Also, interior is great for a nap!
Enjoy your cruise!!!