Dear Sir or Madam,
I'm writing in reponse to the advertisement for baby-sitting, wich was published in www.jobs.org on 20th Jenuary. I enclose a copy of my cv, and I would be grateful if you would consider me for this job.
I think that I would be suitable for the job because I have had a little brother and I was taking caring of him. I worked the last summer with one family babysitting their children, so I have experience with children and I love them. I like playing with children, I think they're naive and honest.
I would enjoy the opportunity to work with kids and I'm avaible to start immediately.
I would be happy to attend the interview and look forward to hearing from you soon.