A lovely polished floor reflects daylight beautifully. As far as colour for floor cover, be objective about trends and dominant colours. Go for something neutral or classical that can weather several trend changes. Alongside the treatment of the floor bear in mind other elements of the room, for example other strong colour and pattern. A simple floor can be altered by a detailed rug or vibrant tones from the walls.
Darker walls can give the illusion of enclosure of the floor and make it seem smaller still.
Clutter on the floor affects the flow of movement and light around the room. Good storage is essential. The less on the floor the better the sense of space. This includes furniture. Avoid dominant pieces that stand out in a room.