We just returned from May 7-14, 2016 Alaska cruise on the Nieuw Amsterdam. We decided to book a fully obstructed cabin, knowing we just need to see some daylight in our room and would be on other decks of the ship a lot.
We were pleasantly surprised with our view in HH 4127:
This is at the back of a lifeboat. Note that there are three taller tenders on each side of the ship that would obstruct your view further.
The window is floor to ceiling but does not open.
Hope that helps a future cruiser in this type of cabin.