It really depends like Color Zen said. Pictures would help. Personally, I love navy. It's a color while also being a neutral and it works well with warm and cool colors.

Ballard Designs have some nice chairs that could work. Even though the table is farmhouse, you can pair anything with it. Even a set of six different chairs might be fun. Collect them. Go to second hand shops and see what you can find, or Craig's list. Chairs are expensive so depending on your budget you can take avenues that fit it. Arhaus has a great selection of chairs.

Would not crowd the entry. For safety sake, would move the keys to inside a cabinet out of sight. In the corner at the bottom of the stairs, you might consider a wall hung corner shelving unit or small corner cabinet. If something similar to this https://www.walmart.com/ip/Elegant-Home-Fashions-Mason-Corner-Floor-Cabinet/53734767?wmlspartner=wlpa&selectedSellerId=0 fits your corner, then, space height permitting, you could invest in two: set one on the floor but remove the feet from the second one and hang it from the wall above the other. To ensure the cabinet does not block the heat/air vents, you might add that second pair of legs to the first to raise its eight for more air flow beneath the cabinet set on the floor.

I prefer round pedestal table with expansion leaves. However I would find a table finish that works well with your wood floors and trim, then choose a complimentary paint color, which may be the same, or very close to what you have selected.