1. Use lighter soft colors, as they will reflect better light. That does not mean to have all the walls painted in white. There are all sorts of lighter pastel colors. Once you picked your walls colors, then you should pick the paint for the moldings. They should be lighter. The lighter tone will look closer making the walls to look more distant, giving the feeling of a larger space.

2. Use mirrors, they reflect day light as well as night light in a wonderfull way.

3. Arrange furniture in angles. The longest straight line is the diagonal, in placing your sofa in a diagonal leads the eye into the longer dimenssion, rather then to the smaller wall. And you will have an extra storage space behind the sofa.

4. Keep the furniture in scale with the room.

5. Use multifunction furniture, will optimize the use of space.