Primary teacher for summer job

I am looking for a NATIVE English speaker. I have two children (4 and 9) and I need someone who can play with them during the summer. Their level of English is already very good. However, they need to keep practising and improving their pronunciation. It will be for 6 weeks (end of June and the whole month of July). I need someone who can come during 4 hours every day, from Monday to Friday.
We live in a flat with beautiful parks in Guadarrama. It is far from Madrid but with direct buses from Moncloa and cercanías to Los Molinos, which is nearby. I am looking for someone calm, down to earth who loves children and knows how to have fun with them. I’m not looking for a nanny but rather for a fun teacher who feels at home and who loves playing with children and telling stories. It would be perfect if you knew how to swim well. And if you have experience with primary students too!  We are a very easy-going family and we would love to hear from you. 
1200 euro/ 6 weeks