For a King size bed, often the main consideration is keeping it from dominating or overwhelming the space. By placing the bed against the back wall or even under a window, you can leave space along three sides for easy movement. Choose taller pedestal lamps to draw the eye upward and place cupboards facing the foot of your bed, to get the best flow.
Although we have King and Queen size bed dimensions in feet, mattress manufacturers often sell in either inches or centimetres, and it would be a good idea to double check your size specifications before you pick your mattress and bedding.
When buying pillows for your Queen size bed, make sure to choose the standard pillow size of 20 x 26 inch rather than the oversized King pillow of 20 x 36 inch, so as not to unnecessarily dwarf your bed design.