Let's do the math: You have a room 20' long. You need 3' on both ends to get by the chairs, so we lose 6 feet from our 20' and we're now down to 14'. Let's take away 18" for a buffet at one end of the room. You're left with 12.5' for your table, and I'd really prefer a smaller table unless you do a large number of humongous dinner parties, requiring seating for 14 people. Some say it's bad luck to have 13 at a table for dinner, but I'm not a believer in that. However, that may be why many tables seat a max of 12. I think a 10' table would work very well, and would indeed prefer it slightly smaller if you would remove a leaf or two to make it a more manageable size for dinner for 6 or 8.

Ideally, you should have 36" of space around your dining table. This Ideabook has some great tips for selecting the best table for your space. I'd love to know more about your plans. Any photos of your dining room or tables you're looking at that you're willing to share? https://www.houzz.com/magazine/how-to-choose-the-right-dining-table-stsetivw-vs~1344061

I would guess (technically) at least an 11x11 so that you would have at least 5ft. of space around the table. However, we have a 60" round table in our 12x12 breakfast nook and it feels very comfortable. We probably wouldn't have wanted it any smaller. So if you have a choice, I would say at a 13x13 or 13x15 space (especially if you'd like to include a console/credenza in the space).

I also think it is a bit too big. It's also pretty heavy duty looking and I'm afraid that's going to take away from your beautiful kitchen. The kitchen really is gorgeous!!!