A passenger accommodation cabin for a vehicle, particularly an aircraft includes a wall defining a passenger accommodation area; a plinth disposed substantially at floor level and adapted to support a mattress within the accommodation area to provide at least one substantially flat bed; a false floor that is selectively movable between a deployed position in which the false floor at least partially covers the mattress and a retracted position for allowing use of the bed; and a seating system having at least one seat and associated supporting structure for supporting the seat within the accommodation area generally above the mattress.