On the Helpling platform, you determine your hourly rate - conveniently online in your profile under "More" and "Set my cleaning prices". 

Here you will receive assistance, e.g. what price other cleaners with a comparable profile in your region have set. Basically, you are free to decide and judge. If you wish, Helpling will gladly provide you with assistance. However, make sure that you are still able to accept countdown offers below your posted price.