Hi Sinala,
Not sure I can help with all your questions.. but ill give it a shot!
Im not sure of the CM salary but CC is $33,500 base plus allowences on top of that.
Alowences are paid into your pay, however they are paid in arrears, so you will recieve your allowences in the following months pay.
CC do not have to share rooms whilst away.
Minimal inflight rest with JQi flights.
There is no fixed overnight allowence, it depends on your destination and the cost of living.. it averages out to be roughly $90-$100 p/n.
This is the information we were given in the assessment days a few weeks ago, therefore this is all Team Jetstar based.
Hope it helps!