I'd do at least a 14x20 if not bigger - when you figure fabric and a quilt frame - plus I'll bet it becomes a place for more storage - the above mentioned dimension may not even be big enough!! I can relate to this size as I had a livingroom once this size - loved it - lot of space, and if I got company, we weren't in each others face and could spread out and still have a nice space to not trip over one another if we needed to get a cup of coffee, or if the guys left for a smoke - or ???? but space is deffinitely the biggest hindrance in downsizing, and don't regret going bigger to catch the overload... believe me - been there, done that!