Since your room is large your color options with this room are quite broad.

For your main color, I would chose to use shades of light gray because it is neutral and seen as elegant and classy. It compliments many colors such as white, blue, and yellow and works well as part of a color scheme in any room. Especially does good enhancement of the wood textures.

Use a matte finish paint because it will be contrasting the polished concrete on the floor.