They pay everyday you are on duty, off days included. They don't pay if you are unpaid leave asked by yourself or by them. They promise at least 10 months of salary. So it means you can be at home during 2 months with no salary.(unpaid leave). The contract is for one year.
I think avion express or get jet or even other acmi providers have much better deal with permanent contract and almost 10k€/m.
Smartlynx is I guess the worst offer at the moment.