Beautiful Models of the world scenery dev has released a free scenery on Simmarket and I guess on their site. Anyway its a nice STOL place for your Twin Otter in Italy.
I also recommend this one too (Pay ware)
Its a beautiful scenery (i have been there IRL) and perfect for the Twin Otter. nice scenic shortish flights in the ALPS from LOWI or LSGS or any airport in that area really.
If you like the stuff by “Beautiful Models of the world”
I recommend going to his homepage and pay a one-time membership for 28,-€. That’s a far cheaper option than buying on simmarket.
Would also be interesting to land the Twin Otter at the private Locher airfield. As far as I know the owner has a PC-21. So landing a Twotter there should work as well