We haven't stayed in this exact cabin, but we were in C750 which has a similar beam. We didn't find it to be a problem.
If you go here: Ruby Princess Deck Plans, Layouts, Pictures, Videos (cruisedeckplans.com)
And select Baja as the deck, you can mouse over an image of the balcony of that cabin. That shows the beam. This wouldn't bother me, but it might bother you.