Seeking native English-speaking nanny for Jul-Aug

We are looking for a native English-speaking nanny for our 2yo and 5month old boys. Working hours will be 10am to 5pm approx. Monday to Friday, although this is still TBD. Previous experience is a must and relevant education is preferred. We need someone who is available at least July and August, although if we find the right person who is also happy to stay longer, we might extend the contract (VISA required!) for less hours during the school term. Housekeeping not required, but if you are happy to cook a little then that would be a plus!
Ideally, you will be a student or recent graduate, with child-care experience, a passion for education, a non-smoker, open-minded, sensible and easy-going. We both speak English so it's OK if you don't speak Spanish - but of course we're happy to help you out if you're learning the language. Looking forward to meeting you soon. (Please note we are only interested if you are currently living in Madrid and are a native English speaker).