On the Serenade, the handle to open the balcony door is on the INSIDE only, it appears they used to be on the outside and inside, but for security reasons (really, who is going to climb 9 decks to break into a cabin, so this is a bit ridiculous to me) there is no handle for the outside. RCCL assumes that being able to only open and lock the door on the inside is secure enough.
Except, the design has a serious flaw. The door is locked with the handle at the noon position. It is designed to be open at the 6 o'clock position. The problem arises you stop at the 4 or 5 o'clock position and unlock the door. If you open the door at this point and go out onto the balcony and close the door, the spring mechanism for the door springs the handle to the noon position, locking the door.
This happened to us, the door opened at the 4 o'clock position and my wife joined me on the balcony. When she shut the door, the handle sprang back to the upright, noon position, locking us out on the balcony. We had nothing but our clothes on. There is NO WAY back in! No phone you can pick up to call, no tool to unlock the door, no way to signal anyone for help. You are at the mercy of someone close by coming out to their balcony you can yell at to get help.
For us, tragedy was averted as we were in port in Key West, facing the dock. We screamed down 9 decks and they sent a security person to open our door.
In my imagination, this could have turned bad very quickly. If we were at sea, or on the other side of the dock, there is no way to get quick help. My wife is a diabetic and in my worst nightmare, if help took hours to find, she could go into diabetic shock and die.
RCCL needs to find a way to get help or unlock the door when the handle springs into the locked position without warning, or at least, issue a warning not to open the door until the handle is at the 6 position.