Do your homework before you even consider it.
Who for? Some obscure email address doesn't give much away - a reputable offer would state the operator, at least!!!! Google couldn't find an operator named Indonesian Airlines, nor could Wiky.
I'm generally aware of the following from blokes who've been there (but not necessarily representative of all operators): lousy pay, understated advice as to what accommodation costs, irregularities with adherence to the rules, breaches of contract etc etc ..... that's enough to concern me.
Like I said, do your homework.