Our Kia ceed is fitted with 17" wheels with 225 45 17 tyres.
During the winter we fit 16" wheels with 205 55 16 tyres.
There is no noticable difference to the ride and noise in the car.
My old BMW was fitted with 205 50 17 run flat tyres.
During the winter it was itted with exactly the same 16" tyres as the Ceed.
Any noise difference was undetectable but the ride was slightly better on the 16" non run flats.
As RobJP says 17" is not too radical a wheel/tyre combination. The problem is with those fitted with tyres that look little more than a painted line of the rim.
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