BrianORD,
your concern for security is right but I don't think it covers general information such as Chris2rire was asking.
Besides, information like cabin layouts or number of seats on an aircraft type can be found on any airline timetable.
Chris2rire,
it depends on the airline and on the specific contract it has with its Cabin Crew.
Usually crew rest is only on Long Haul, but there are exceptions for long flights of Medium Haul. A crew can work outbound and inbound flights of Medium or Short Haul unless there is a crew change. Ex: a crew can flyLHR -CDG,CDG-LHR, LHR-DUS (from where another crew will start their duty) and then spend the night in DUS and be on duty again the following day to operate more flights.