We met a couple staying in the handicap suite on the Shadow and they really enjoyed it. They did mention that the room steward informed them that they could not take furniture out there and leave it, but they had room service each morning and just took a chair out there to sit while they ate. It is a common balcony but only 9 rooms share it. It is blocked at both ends so other passengers cannot access it. I do know the passengers enjoyed being able to access the outdoors from their suite. On my 10 days cruise, I never saw many people use the balcony so I don't think you would be bumping in to many others. It is a beautiful ship though, so if you haven't tried it, I would recommend you do.
Susan