Limestone is surprisingly a durable flooring choice. Most people tend to use honed limestone for floors, because it is a lot less likely to show the scratches it will incur. But there really are a number of finishes you can go with from shiny to scratched or brushed. (Be careful though, aged finishes make the stone a lot more porous and, therefore, high maintenance.) Limestone also comes in a number of colors, ranging from light beige to dark grey. Limestone is also probably going to be a lot colder than wood flooring, but you can get rugs or radiant heating. Like using limestone for your countertops, you just have to make sure you seal it or use an impregnator. On a routine basis, all you need to do is mop the floor. Although it is not one of the hardest stones, in the chance that you chip a piece of the floor, a piece can be epoxied into place, creating a seamless finish.

Wood flooring is a great way to warm up a space. While I think that limestone has a cooling effect, wood is just the opposite. Wood will be softer on your feet, and won't get as cold. It will also scratch, but you can refinish the wood whenever you like. It's also wise to seal the wood, but daily maintenance is pretty easy.

I think both options seem like they would do well in a room with heavy traffic. It really is going to be which look you are going for. Here are a couple of fabricators who specialize in both of those flooring materials. There may be more specific maintenance questions they cover pertaining to specific varieties.

http://www.limestone.com/index.html
http://www.armstrong.com/flooring/products/hardwood/solid/_/N-67oZ736

If I had the choice to do it again I would do limestone thru the house, I have granite in the kitchen now and walnut stained floors in the livingroom, then I have limestone thru the entire cottage, which we love, very durable, not much can be seen on the floor. We are in Canada and it's cold, but I am always in slippers or indoor shoes , I love the look of my wood floors but every thing scratches it and everything shows, nothing scratches the limestone. We used Ivory limestone honed/filled.