Simon Markson of Markson Pianos says, ‘Placing the piano in an ideal position would depend on various factors, such as door openings, windows,proximity of radiators but generally speaking a grand piano should be kept away from direct light source and at least 3 feet away from a radiator. It would be positioned at an angle to the audience whereby they could view the hands of the pianists on the keyboard.Naturally they would need to leave around 3 feet space for the piano stool too.