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the balloon has an inside and a centre within it
Neil - It's space itself that is expanding, so if you remember that every point in the universe is moving away from every other point, then it's easy to see that there can be no centre.
And, as far as the picture of the large scale structure of the universe (umicky). That is just a way of showing things on a 2D map. An atlas of the Earth, printed on a flat sheet of paper, has edges to it but the GLOBE on which we live, doesn't. The picture can't be relied on to make sophisticated conclusions any more than a flat atlas could be used to prove to a 'flat earth' society member that the earth is spherical.
I was going to post a 3D picture
as far as we are concerned their is an edge to the universe ,the observable universe.