Personally I prefer 14" with slightly lower profile tyres as I think they look better but that's just my personal preference.
Wheels are 4X98 PCD not sure about offset options someone else will know better than me I'm sure.
As for width 185 is a good size for a 131. A bit more grip and looks a bit wider but not overtyred.
As you don't have power steering I wouldn't advise going too wide as it makes the steering too heavy.
It also depends how you want the car to look. Too wide and you'll look like a boy racer