Sanitary module arrangement for installation in an aircraft cabin, having: - a sanitary module, the interior of which is separated by a boundary wall from a region of the aircraft cabin adjacent to the sanitary module, a sanitary fitment and a first trolley parking place for accommodating at least one trolley suitable for holding supply goods for the passengers in the aircraft cabin being provided in the interior of the sanitary module, - a second trolley parking place, provided adjacent to an outer surface of the boundary wall, for accommodating at least one trolley suitable for holding supply goods for the passengers in the aircraft cabin outside the sanitary module, wherein there is formed in the boundary wall a closable opening, through which a trolley can be displaced between the first trolley parking place in the interior of the sanitary module and the second trolley parking place provided adjacent to an outer surface of the boundary wall, - a trolley housing for accommodating at least one trolley, which housing comprises a top plate, a first side wall extending substantially perpendicularly to the top plate, and a second side wall opposite the first side wall, the first side wall of the trolley housing being configured to close the opening formed in the boundary wall when the trolley housing accommodates a trolley parked in the first trolley parking place, and the second side wall of the trolley housing being configured to close the opening formed in the boundary wall when the trolley housing accommodates a trolley parked in the second trolley parking place, and - a trolley fastening device which comprises a holder system for detachably fastening a trolley parked in the second trolley parking place, the holder system having a holder attached to the outer surface of the boundary wall, characterised in that the holder of the holder system comprises at least one latch device attached to the outer surface of the boundary wall, which is configured to cooperate with the first side wall of the trolley housing when the trolley housing accommodates a trolley parked in the first trolley parking place, and which is furthermore configured to cooperate with a complementary latch device, formed in the top plate of the trolley housing, when the trolley housing accommodates a trolley parked in the second trolley parking place. - a sanitary module, the interior of which is separated by a boundary wall from a region of the aircraft cabin adjacent to the sanitary module, a sanitary fitment and a first trolley parking place for accommodating at least one trolley suitable for holding supply goods for the passengers in the aircraft cabin being provided in the interior of the sanitary module, - a second trolley parking place, provided adjacent to an outer surface of the boundary wall, for accommodating at least one trolley suitable for holding supply goods for the passengers in the aircraft cabin outside the sanitary module, wherein there is formed in the boundary wall a closable opening, through which a trolley can be displaced between the first trolley parking place in the interior of the sanitary module and the second trolley parking place provided adjacent to an outer surface of the boundary wall, - a trolley housing for accommodating at least one trolley, which housing comprises a top plate, a first side wall extending substantially perpendicularly to the top plate, and a second side wall opposite the first side wall, the first side wall of the trolley housing being configured to close the opening formed in the boundary wall when the trolley housing accommodates a trolley parked in the first trolley parking place, and the second side wall of the trolley housing being configured to close the opening formed in the boundary wall when the trolley housing accommodates a trolley parked in the second trolley parking place, and - a trolley fastening device which comprises a holder system for detachably fastening a trolley parked in the second trolley parking place, the holder system having a holder attached to the outer surface of the boundary wall,