I have stayed in an inside room on the Sea Princess.
They are very small rooms but are the same size as a window cabin so no point upgrading to get a bigger room.
That said they are well laid out and have plenty of storage including coathangers.
The room is near the pool deck so they can be outside with a terrific view in no time.
We have found no problem with inside rooms (two people) on Sun class ships.

The only thing I would be worried about when it comes to this room is the kitchen of the buffet is located above it and there could be noise early in the morning as they prepare food for the day.