Draylson, my corrections are shown below:
My dream house is not a big one. Instead, it is small and cosy, with space enough to live comfortably. It has a backyard where I can grow some fruits and vegetables, as well as a barbecue area where I can receive friends and family. Also, it is a two-storey house, situated / located / built on a high hill, and it has a balcony with a downtown / town centre view and its high buildings.