V50 rims… how hard are 17″ or 18″ (or more ?)

Hello together, am freshly baked (4 days) V50 owner. The good piece is light blue metallic 2.0D Bj2005 Leder Tempomat Standheizung (geil!) and think apart from the iphone-an-volvo-box from grom over leg gowns (velves & tires) for the summer after… currently there are of course 16″ winter tires on it, which comes very “commod” = cozy. Not that I want to race with the car, should definitely remain suitable for everyday use, but from the look I would like 18″ or 19″ rims already, only the question from where it becomes too uncomfortable. Go 18″ still or is that then already “real hard”? Lowering and/or sports gear is probably not possible, the way to the house of the mother-in-law wants to be driven regularly and includes a piece of official field and forest path! I also drive a Porsche 993 Targa (there is a recommendation for Porsche the 18″ because of the comparatively soft car not) to call 17″ serial rims, that would be sportily comfortable… would be nice to say with T. 5 wheels or to keep a little bit of fun.