In the cover letter i have to be really persuasive, and i have to show that im a smart student that deserves to go with erasmus to another country.
Half to one A4 page is good, and should be enough for the organisers to get to know you. If the letter is longer than a A4.
4 фрілансерів(-и) у середньому готові виконати цю роботу за €39
I have experience in those kind of things, did ERASMUS myself so my cover letter was obviosuly convincing. I'll deliver you everything you need on time and am very reliable and commited.