Otherwise, jack on the flat areas of the subframes near to the suspension mounts... NEVER on the floor or on the chassis rails as already said...
I only use the subframe to jack up on if I subsequently then want the car on axle stands. I pop them under the sill jacking points...
To jack up a 207 you need a trolley jack that's very low-reach
Chris, I agree the sill jacking points can get frail but on a 207 they should still be fine unless the car has lived in a wet salt mine all its life..
If you jack on a sill point and you hear crunching noises then stop and jack on the subframes!!!