I brought the description of the outside of the house to the beginning of the essay, so that it flows more logically. I also made some changes that reflect American usage, but you possibly don't want that.
Here's how I would edit this paragraph:
My dream house is located in the heart of California, in the quietest residential neighborhood of the beautiful town of Cannes. The house sits in a large garden with a swimming pool. It is built with brick and stone, in the style of the 19th century. It has a sloping gray roof with a big chimney. The lawn is surrounded by flowering fruit trees and blossoming shrubs, and there is a garden path that winds from the terrace to the swimming pool. Near the swimming pool is an arbor with a grill and a gazebo-style summer house. The garage and a modern gymnasium are in the basement.
Inside the house, the central hall on the ground floor has French windows and a fireplace. Opening off the hall are the kitchen, the living room, and the dining room. The kitchen cabinetry is white wood, and there's a built-in refrigerator, oven, and dishwasher. The living room is the biggest room in the house. The walls are white, decorated with oversized graphics, mostly black-and-white enlargements of photos of my family. In the middle of the room is a big, soft, comfortable cream sofa with brightly-patterned throw cushions. The room has special built-in alcoves for bookshelves. A door opens from the living room to the terrace, with its spectacular panoramic view of the Bay of Cannes.
In the corner of the hall is spiral stairway. On the upper floor are two bedrooms with their own bathrooms, as well as an office. The office is furnished with a rare antique table. Up one more flight is my bedroom in the attic, with skylights over the bed. The attic includes a bathroom with pale green tiles and a big closet. My bedroom is decorated in pink and white.
I'd love to live in a house like this. I hope one day my dreams come true.