Should be ok if you've bent/cut the bumper bracket excesses in the front arches out of the way. I'm lowered about 50mm, and had 205s but had rubbing on the bracket before I sorted them out. Only had 195s on since sorting the brackets, but I think 205s would be fine.
I run 195 on the fronts and 205 on the rear, it alters the car's nature a bit, brings a bit of understeer around tight corners and roundabouts but feels much more comfortable at speed through sweeping/longer bends for me. Personal preference though.