This table is absolutely beautiful and looks more expensive than I was expecting. The wood grain looks similar to the picture and is, if anything, prettier in person. I would guess the table seats a comfortable four/snug six with the leaf out and a comfortable six/very snug eight with the leaf in. I currently have six chairs around the table with the leaf out, and they fit well. The leaf is attached via a butterfly mechanism that was easy enough to operate.
I can't comment on the chairs, as I purchased the table alone. The accompanying chairs weren't quite to my taste, but I easily found other walnut chairs that matched well.
All in all, this table goes beautifully with the rest of my mid-century/Scandinavian furniture. The quality is better than I expected, and I'm very pleased with the purchase.