Sailing in the Constellation would be like sailing on the Rhapsody of the seas size wise , but just more chilled, and a much nicer ship
Do not expect the same bell and whistle as the Icon , as it is a 24 year old ship
Constrellation is like a classic suit not in your face but so comfortable ,
Icon would be more like fast fashion , looks great but not lasting
Also sailing in the Med is different than sailing in the Caribbean, much more exciting, it is about the ports not as much about the ship