No layovers on A330 IN EUROPE;
The layovers are in USA, Asia or Africa.
I would not think about safety as an issue in Turkey nowadays, at least not more than any other countries; the main hitch in THY for expats is the fact that salaries are paid in TL which remains an extremely volatile currency.
2years ago you could get 1 euro with 3.30 tl and a A330 CAPTAIN was able to bring 10000 euros on a normal month, 120000 euros on a month with bonus .
today you need 4.90 tl to get one euro and salary increase did not compensate their local inflation. As a result, a large number of captains left the thy boat.
Nowadays, this company is made of a majority of thy pilots who can be extremely kind if you are honest with them. I do believe they can do better that they do nowadays in a lot of sectors but a significant progression occured over the last decade in the training department .
With their ambitious project ( new airport, 40 A350,etc) THY has to show the world they can attract more expats to cooperate and make the most of this airline.