Native english babysitter

I'm looking for an english speaking girl (native) to play two hours per week with my two little children (5 and 4 years old).

I want them to listen to english and begin understanding it. The goal is that the babysitter only speaks english with them while playing.

Salary, day and hours to be arranged.

We live near Suances metro station and bus 153 (Quinta de los Molinos).