While you do not give a stateroom number, you should have adequate space; the bed configuration will vary depending on which room you have, first there are two single beds which can be put together to form a queen size bed, or they can be separated, also you have a bed (or two) which may drop from the ceiling which the kids usually love (the stateroom attendant prepares this each evening and puts it away during their morning visits); there may also be a small pull out sofabed possibly.
You're best bet would be to contact your travel agent or NCL directly to inquire about the bed configuration.