Saul Upholstered Panel Configurable Bedroom Set
Your cat likely stepped in something that has lightly stripped away some of the layers of wax or polish on your table - or the pads on your pet's paws are abrasive enough to have done it. If you want to get rid of the paw prints, you will need to remove the built-up layers of old polish.
If you aren't sure if the convenience of the additional counter space a center island would provide is worth the extra miles you'll be walking to go around it, or if that sofa will look too large in your living room, try arranging some large cardboard boxes to approximate the size of the furniture piece before you purchase it. It will help you visualize the size and mass of the furniture in a very concrete way and you can get a better idea of how the space will work in three dimensions.