Hi. A round table will be the easiest to walk around and the most efficient as far as a space-saver.

In an ideal world, you'd choose a 48" round table. That would allow plenty of space to walk around. However, that will allow you only 4-5 seats.

I would recommend a larger table at 72" in diameter. This will seat 6. You could fit 8 if needed.

If you have any other furniture in the room, you'll have to consider that when choosing the size.