"The only cabin that has an uncovered balcony is 1600. It is a GS corner aft and I would not recommend it to anyone who wants to have a little protection from the elements. The cabin also has an awkward layout.
If you want a larger balcony with an obstruction try 1098 or 1598. For the life of me I would not call it obstructed. We have sailed in 1098 and the aft hull does diminish some view but it is also a larger balcony. The window washing machine is just off the aft of the balcony but it was never in use when we were in the cabin. It's perfect for a balcony in the rain! Unlike some lines RCI does not discount these cabins."
RCCL Serenade of the Seas