Depending on the time of day and the weather, there may plenty of potential observers in almost any direction, so be alert and ensure you aren't observed retrieving or replacing the cache. The container isn’t very big, so small swaps only please. Please note that the location is frequented by graffiti painters, so please note exactly where you found the cache and return it to the same spot and orientation to ensure that the cache is well hidden from casual observation again before you leave.
Have you visited the Geocaching Australia Forum?