We never had the S-line edition in the UK, although we did have a similar Sport spec, but it didn't have the black headliner and half-leather/half-alcantara seats that the European one did. I'm not sure if that one has the black headliner and sunvisors either. I wonder if the German a2freun.de forum might be able to offer a more informed opinion.
The Sport seats in that yellow Storm are very interesting though - half-leather, but although the centre section is fabric, that's not alcantara, it's something else. And they're heated - the best of all worlds. I've never even seen a photo of a set like that before, let alone in real life. Might they be a retrim/retrofit or was there a European option for those?
If that's a TDI90, we have remaps up to around 125bhp for it in the UK, and although I've read no horror stories about that sort of power/torque trashing the drivetrain, maybe that's because no-one's had one in for long enough yet. But at that mileage, before you even think about remapping it, the clutch and DMF will want changing if not already done, you'd probably want to see evidence of a new turbo too.