It is hard to tell without seeing the property, the neighbors' properties, how much noise and what kind, and is there any visual of the noisy street, you are not talking about a highway....right
So potentially, putting in a nice big fountain, and have some inside outside music going for showings
should really help.... and birdfeeders will attract a lot of singing chirping birds
and setting up the backyard in a way that it looks like your are using it all the time.... If the new buyers
see that you are out there, with a nice table and chairs and a lovely bright colored large Umbrella and beautiful blooming flower pots surrounding the area.... just make the outdoor space look inviting...
and discuss with your Realtor if you should offer something to the buyer for installing a fence, get an estimate
for a fence in the back towards the noisy road.....
Hope that helps a bit...
Your Chicago and Northern Illinois Expert