Yes, but make sure you change all four not just a pair. The wheels should fit 205s fairly easily but I wouldnt go any wider. The overall circumference of wheel will increase which in theory will knock speedo out, but I doubt if this will be affected by much more than two or three mph. You will be going slightly faster than indicated by speedo, but since the speedo reads high anyway it should improve the accuracy!!
I know this is common sense but I mixed tyre sizes on an old 309 once think I kept original 185/55/15s on front but put 195/50/15s (cheaper) on rear. This was (un-suprisingly) a very very bad idea, it made the car even worse to drive!
I have however changed from 185/55s and 195/55s to 195/50s in complete sets on many hatches with no ill effects.