I suggest you go to the store and look at the two pieces together. Since the legs on the table are slanted the bench may or may not fit under the legs properly. As for the general length, a bench of that size might look visually ok when the leaf is not in the table but it will look too small when you are using the leaf. I have a bench at my table and measured it for reference. My table is 82 inches long and my bench is 70 inches long. Between my table legs is 71.5 inches.

Here is a picture of the space. I didn't want to share because of all of the personal photos but I figured out how to blur them. There seems to be a lot of visual space to work with but not much physical space.

Overall it looks good, but move your decor away from the table corners. For me, I would want just a bit more space around the table. I like at least 24" on the sides with seating, so you don't kick/hit the table when you cross your legs. I would also get a slightly taller table, but I know that is hard to find/buy as all manufacturers keep making shorter and shorter tables. One way for them to cut costs! I shopped for tables that were 18" to 20" high as I don't like the coffee table to be shorter than the seat/cushion height, specially with transitional/traditional sofas/chairs.

IMO you place lamps so they give enough light to read by so how high does the lamp need to be to give you that. I like an end table to be comfotable to reach to put down a drink so figure that out then see if that lamp works with that height table.