I think you make some good points in your essay and have some good information! One thing you might want to consider doing is defining what you mean by "schools." Are you writing only about universities? In English, "schools" can refer to anything from kindergarten for 5-year-olds to professional school, like law school. You might want to narrow it down a little by specifically saying which type you mean.
It's challenging to write in a foreign language. Although I understand that you need to keep it fairly simple because you are not completely fluent in English, you still need to be careful about being overly simplistic--that is, about saying things that are too obvious. For example, "All schools have their own addresses and locations such as countryside, a center of city, or a suburb." It might be better to say, "When choosing a school, it is important to consider the location. Whether a school is located in the countryside, the center of a city, or a suburb will have an effect on how well that school works for you."
Go through your essay carefully to make sure you include articles (a, an, the) where needed. For instance, "If you live in the countryside..."
While I can't edit the whole thing for you, I will give you some tips on the ending: "When you choose your school, you have to consider many things about your school's location, including tuition fees, transportation, access to housing and your job. I like to walk and use public transportation. I am an international student; I will go back to my country after graduation, so I don't need to buy a car. Therefore, a school in the city center would work best for me."
Best of luck in your studies!