native English speaker to babysit and teach English

hola! I am a 21 year old female native english speaker from london. 
I am looking to babysit children, I love kids! I can play games with them and do activities, and show them english!
I moved here for a year to study, so I am afraid I am not free everyday- I can do weekends, monday afternoon and evening, and thursday and friday evenings. must be in madrid area. 
my level of spanish is intermediate, however I can understand a lot more! :)