Are you in need of a wheelchair accessible cabin? If not, are you aware that they have the option to move you to another cabin if someone wants to book an accessible cabin? The layout in the accessible cabin is different from the other cabins. They don't have a sofa, they have a large chair instead.
Any aft cabin is wonderful. We have had several of the corner FV cabins and absolutely love them. I would rather have an FV than a CC. However, you have brought up some questions about the deck 9 FV and the eating area directly above.
I have read a few complaints about debris being blown down onto the balcony, but I have heard MORE good things than bad. You have about 3/4 of the balcony covered so you do have privacy.
Here are a couple of pictures of the aft so you can get a better idea of what it looks like.

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