Opening up a boxy home.
By removing a few walls, the main living areas (kitchen and den) can have a nicer flow and appear more visually open and less cramped. You could even replace the main dividing wall (if not load bearing) with an island or a peninsula to connect the two spaces together.
Other ways to open up an older home would be to provide a seamless transition from one room to the next by installing the same flooring throughout each room such as hard¬woods. Lightening up these areas with a lighter paint color on the walls (try Sherwin Williams “Colonade Gray” instead of darker/bolder tones) will also make the spaces appear larger.