Will you be using it for outdoor entertainment, relaxing, exercising, or you don't have any plans to sit outdoors and want to purely beautify it, so that it embraces your house? Accordingly, you can add the necessary elements. Remember that, while you add the necessary decor, it must be such that that it also works as a beautifying element.
A set of 2 - 4 chairs and a table, depending upon the available space, is a good idea. You can have two chairs and a table and further, add a fireplace, as well. This set up can occupy one corner. Even, if you won't be spending much time here chatting or relaxing, you must at least have a single relaxing chair.
Having a garden mirror against the fence is awesome to add the finishing touch to the area. This will also make it look larger. Finally, consider various outdoor lighting to illuminate these in the best way and also make it look larger and give it a grand appearance.