Hi kangadr,
As far as size of an ottoman in relation to the sofa, I'd say to follow the same guidelines as with finding the "right" size coffee table.....
- Approximately 2/3 of the length of the sofa and probably no longer than 3/4 of sofa length (so around 64-72"....probably can be ok at 60" too).
- Height to be same height as sofa seat....or can be approx. 1-2 inches lower than sofa seat height.
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Ottoman
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