Advise the stateroom number and someone can look at the plan of ship and maybe reassure you. Do this by adding a COMMENT to this note.
Most 4 berth cabins only show the 2 'main' beds on the deck plan. On most ships the 2 extra 'beds' are bunks which retract into the ceiling or hinge against the upper wall. Don't worry, the steward folds them away during the day & prepares them for use during early evening. Having said that some NCL ships have a 'rollout pullman' which is a mattress on castors which lives under the normal beds. Check this out with their Clueless Department as to this particular ship. Demand to speak to someone who can give you a definitive answer, or maybe someone has recent knowledge of 4 berths reading this, can post their response. Good Luck!!
We have a balcony stateroom booked on the NCL Jewel and the extra bed in this case is a double sofa bed. Hope this helps.
We had a balcony 4 birth cabin on the jade 2 weeks ago, there was two twin beds pushed together a sofa bed that rolls out and a single bed that lowers down from the celing. The cabin is a decent size and we had no trouble with 3 adults and a baby.