One such point may be the amount of hours regarding your weekly teaching load in relation to your monthly salary.

Turnoi is quite right on this. The contract should be taken time over, not rushed into!

Ask questions first, to avoid problems further down the line! 5,000 for 20 hours a week, even with free digs, is nothing but indentured servitude...

now 5,500 for say 16 classes a week and free accomodation is more like it!