Yep, I've been in one of those on the Sovereign, they are tiny but it is doable! The cabin layout is fine, you can do this! Just think about 2 feet of space between the twin beds!
The Sovereign was built in the late 80's and Royal Caribbean was known for their small cabins in that class of ship, Majesty and Monarch, too. She wowed everyone though with her atrium and overall interior design. I enjoyed the Sovereign, a great ship!
Carnival always touted their bigger cabins so when RCI built the next class, Vision. think Splendour, Grandeur, etc. they have a little better cabin space. Their newer ships they are right up there with other cruise lines for cabin space.