We were in #5020 this past July with 2 adults/2 children ages 10 and 13 and had plenty of room.
The sofa near the window turns into a bed and there is a pull down bunk right above it. Your room steward will put both away in the am and make them up at night. The kids had plenty of room to sleep.
We never felt crowded in the room, plenty of room for 4 people. Congratulations in getting one one of these rooms, you are going to love it!!