A passenger accommodation cabin (15) for a vehicle, particularly an aircraft, which comprises: wall means (12, 14, 16) defining a passenger accommodation area; plinth means (10) disposed substantially at floor level and adapted to support mattress means (25) within said accommodation area to provide at least one substantially flat bed; false floor means (42) that are selectively movable between a deployed position in which said false floor means at least partially cover the mattress means and a retracted position for allowing use of said bed; and seating means (30) comprising at least one seat and associated supporting structure for supporting said seat within the accommodation area generally above the mattress means.