If you want the uncreased leather look, it is not that difficult to achieve. I have done it countless times on many cars.
Firstly, make sure the seats are clean.
Use gliptone conditioner, and apply it in direct sunlight - the hotter the better.
The heat from the conditioner with the sun will "pop" most of the creases out
Keep repeating this as it takes quite a bit of conditioner to get them out. I tend to do this excecise over a few days, as doing it just the once doesn't work too well.
Don't bother doing this in winter months - it won't work.
Gotten rid of nasty sharp dings from objects that have damaged leather seats this way too.
2002 Audi S8 as an example...
Back on topic... This car is a beauty, and one of the best ones out there for sure. There are better, and there are worse of course too
You have to make a call as to whether it is worth the asking price as it is pretty much a forgotten Fiat now.
Any car is only worth what someone is willing to pay for it, and I can tell from those photos that allcouped up had spent a lot of money on it since my brief ownership.
Would I buy it back? Probably not, and cartainly not at that price.