Purchase advice Mini Cooper S

Hello together, I would like to buy a cooper s bj. 12/2004 as a everyday fun mobile, but have zero experiences in the mini area. Maybe you can help me there. I already have an offer or I have already tried it and it is crazy how the thing goes and drives. If a Cooper S with 170 hp and 117.000 km from the year 12/2004. Check booklet maintained and 1st hand, the general condition is in my opinion really good. Only the Keirippen strap whistles something. Maybe you can give me some tips on the ride. Many thanks already once. Greeting tim