I think a center table would look nice. Have you tried marking out the table on the floor and seeing how that would work?

I assume that the front door and closet doors won't often be wide open at the same time, so it seems to me that that size table would work fine. I'd go for a round table, not square.

A good way to "test" it is to cut out that same size in some sort of kraft paper or even newspaper, and walk around it for a few days and see how it feels.

If you're still unsure, it looks like you have space for a decent size table or bureau to the left of the door as you come in. The only issue with a center table is that I would feel compelled to make it look pretty and clean all the time, and then where do you throw your keys, mail, etc?

Review your projected pathways. Will your family use the front entrance as the main entrance or is it just for guests. How often will you walk from the DR to the Library(?). If the entry way won't be used as a traffic walkway I wouldn't worry about it.

I'm a little skeptical. It might look okay, but with the entry door off-center in the room and all of the other openings, I'd have to try it out on approval before I committed to it.

Perhaps an oval table would fit the space better?

Thanks for the feedback. The entry will be 99% guest traffic and I don't see much traffic between the Library (AKA toy dump) and Dining. I'll try to mock something up to get a better sense.

As was suggested here, a mock up is something you should try. However cut out a piece of cardboard the size and shape you want. Then place it on TOP of a box, crate, etc. You'll need the height to see if you are going to run into it with your hip.

Are you now living in the house? The measurements on the blueprint don't add up to actual size of the area since the 10'8" measurement is including a stud wall (plus...10'8" + 1'8" doesn't add up to 12' 6"). Actual usable area is less than 10' 8" x 11' 8" and with walls/doors on 4 sides, in addition to cross-traffic flow, I'd say no, you don't have room for a table.

My entry is 9'3" by 12' 6" (opening into large hallway) and there's no way I have room for a table in the center of the area.