English teacher in las tablas

We are looking for a native speaker English teacher for our 5 and 9 years old children to play with them and speak in English one and a half hour every week. They study English at school but we want to improve their speaking  capabilities. The idea is to play and speak in English with them and to revise the classes. It’s important that they feel comfortable and can speak and be corrected in order to be more secure with the English language. 
You would work with us 1 day per week, 1 and a half hours, 18:00 to 19:30, we prefer on Monday or Wednesday. 
We live in the north of Madrid (Las tablas).
Starting: A soon as possible
Salary: 50 euros / month