No the offset should not affect the handling once you put on the right dimension of tyres.
You get increased danger from ruts with extra width, but your width remains the same, so you should not notice much difference.
You may end up with more weight per corner for the 19inch wheels and so a 10 years suspension part, may need an overhaul sooner than later, but you have to drive to find out about that.
All these Corsas sitting on XXX inch wheels in car parks and under bridges, do all the mileage of the world not to worry about anything like wear.
Most of the people add on the big wheels for the looks. The 17inch on the second generation car is the right call between comfort and handling.
But the third generation car comes with two different wheelbases. The sedan is a new longer wheelbase, while the estate is the old second generation dimension.
They still fit 19inch wheels to both of them but all the online reviews mention that the estate handles better because of the shorter wheelbase.
So I suppose the extra 10cm of the sedan wheelbase will not do any good in trying to correct inside the corner but the 19inch wheel will look better on the image front.
I think jumping from the 17 inch to the 19 inch wheels may be interesting in winter and/or wet conditions, so keep in that mind that if you want to drive all year around.