Your floors look to be classic solid oak - which makes it easy to match. While many of the newer floors are very pretty, they tend to change out the styles and after about 18 months or so it can be hard to find a match. This is a timeless, if not trendy floor and can be found in homes over a hundred years old - many of them very elegant. They will look great refinished. They appear to be natural, but the finish has ambered over time as old oil base finishes tend to do. You can refinish and stain them to match new site finished oak floors. Natural or a light stain is pretty and flexible style wise. Very dark stains show dust and scratches more. It often does not go well to try to make them gray. It often doesn't look great, especially if they are red oak and it is a lot of money to spend for something that is trendy and will go out of fashion in a decade. You can have your flooring person put some sample stains on some scrap pieces to help you make a decision. If you really like a stain, ask to have a few different pieces of wood samples done because there is a little variation from piece to piece and you want to get a sense of the lighter and darker tones of the same stain on different pieces.

Any yellow or orange based wood tone lighter than your table. However, I'd be more concerned with a color that works with your home's exterior. decor is easier to change than home and deck colors.

Looks brown to me. Seriously, it's impossible to know, and the answer is almost certainly not simple. Wood finishes typically involve multiple steps, starting with a natural product that is not the same color from tree to tree and sometimes changes color over time. Results will vary as well with the nature and sheen of the topcoat and, of course lighting. Who knows what the photographer did to manipulate the image after that. If this piece has been colored during the finishing process it may have had a grain filler, with or without added color, one or more wood dyes, a color glaze coat over that, and a top coat that may or may not contribute much color but will affect the perception of the color. If you want predictable uniformity, use paint. At this resolution it's not really possible to say exactly what the wood is. The grain pattern would be consistent with cherry, maple, or many other woods.

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