Hello Sir,
As you can see I'm not native speaker, and don't have biggest rate. The thing that I'm the perfect candidate is that I have the passion for writing and your offer won't be a difficult for me. That I can tell for sure is that I'm at your service and ready to start the job. I don't get many projects at once, just because I won't to finish my job first and make the employer satisfied.
Sincerely, Ivan Ivanov