215 is as wide as is practical to fit between the suspension and the arch. Offset is relative to width, go back to 1010 for a comparison between the 2. 205 is a safer width.
Not stretched. Just in case you want to go there, there are technicalities to the legality of changes to the rim size.
Please don't take my words in this thread as all the info you need, there are many threads on rim size, offset, tyre proportions, handling, etc in the Polo section.
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