As the image is pulled from the maps service using your postcode, we are unable to change the way this is displayed. However, the maps are normally accurate to within 50-100 meters of the postcode you’ve typed in.

You can always make a note on your advert just to make your location clear:

• Click on ‘My details‘ at the top of your Dashboard, and then ‘The home I’ve got‘
  Select the ‘Features‘ option and enter the information in the box at the bottom of this page
  Click ‘Next‘ at the bottom of this page. This will show straight away for other swappers when they see your home in their search results