I was curious as we never sail NCL.
I looked up Viva..It's a very big ship with alot going on there...maybe too much...not sure it would fit our more relaxed style that we enjoy on X.
On Celeb E Class, we have no issues with the Inf Balc but it is cleatly NOT a balcony..more like a sun room with an operable window.. We keep the bi fold doors open between the cabin and inf veranda area; and place the chairs and table facing inward to enlarge the cabin space which is narrow. We open the window to look out at times or for photos. We would find the inf veranda area very confining with bifolds closed
Sunset Verandas have real aft balcs and larger staterooms, but book up quickly..we enjoy them.