Nothing wrong with the Riveria or Main. A midship cabin on Riveria will be a great choice if motion sickness is a concern. Engine noise also will not be a concern with a midship cabin.
Yes there is life down there...
8 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway, Escape
11 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta X2 S/V Mandalay X2, S/V Vela
HAL Statendam, MSC Divina