A small, leather sofa with attached chaise needs a small coffee table. I can't seem to find a good solution. A beautiful Oriental carpet is in the 'L', and I don't want to hide it with a heavy piece of furniture.
A round table with a glass top and metal or wood legs.
Totally depends upon your style -- more casual or more formal -- and your budget.
Agree that round is likely going to be your best choice so you're not knee knocking and stumbling over the table ... but you might consider a round ottoman -- even a storage ottoman, either with a flip top for a table or, depending on the surface of the ottoman, to be used with a tray for a table surface. The price range is from "big box store" price to well over a thousand or more if leather.
Something else to consider: add wheels in lieu of legs to either your table or ottoman so you can easily push/roll it aside as you want to stand up and/or move it over to where it is needed -- and out of the way where it is not.
If you want something inexpensive and temporary -- perhaps a bit quirky -- until you find exactly the table you want, you might consider a totally fabric ottoman on which you could use a round tray for the table top.
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Great ideas! Thank you!