This should be the first thing you consider once you have determined what size your accent chair should be. The chair should make the room more inviting and cozier, without cluttering it up or making the space difficult to navigate.
Look for an empty space within the room that you can fill up with the chair - a corner or an area next to a window would be best.
Avoid placing the chair near the door - this will probably impede your ability to open the door, or may result in the chair being completely hidden from view when the door is opened
Plan for a clearance space of about 30” on at least two sides of the chair to ensure easy access