To everyone eyes you are just a cleaner that works in Iceberg Lounge but in reality you are The Cuckoo, Oswald Cobblepot most trusted spy and snitch. Once you are placed in a enemy base or territory and have everyone trust in you, you slowly make everyone turn on each other and steal the information to give back to Oswald Cobblepot.
You have your own rules you follow by and simply he can't argue against you about it. (1) you refuse to kill any innocent people. (2) you refuse to sleep around to get what you want or information. (3) if there are children around, you well not do the task until the children is place in a more safer location and will not see or hear what happens at that moment.
It easier to hide as a cleaner because no one would think a housekeeper would say anything, you play your cards right and everyone falls right into your hands. Oswald Cobblepot trust towards you never challenge because you have no reason to betray him, he took you in and gave you a safe place to call home. You were a street rat before you meant him, your loyalty to him would be one day the death of you.