12 years old MINI One or something else?

Hello together, I currently own a VW Polo 6N2 from 2001 and think about buying a Mini One from 2006. I’ve had the Polo for many years, which is why I’d like to buy a Mini. More precisely this one here:https://www.autoscout24.de/…/…a1b3-16d9-4f24-918f-3651f9740d1d?… HU seems to be new, checkbook stuffed is also and shortcomings were at least not mentioned. My Polo, which has a new TÜV since the beginning of the week, I would also like to hand in at the trade. Is a Min i One (or in particular the listed offer) recommended? What would be a fair offer (x Euro + VW Polo)? Greetings Mike