My wife and I flew Peg. back in 2010. It was a wonderful and safe airline- very modern 737. Wonderful crew etc etc. We fly from Istanbul to Central Turkey. If we ever find ourselves back to Turkey (and we hope we do we loved our trip) we would not hesitate for a second to fly Peg.

One tip...make sure you know what Istanbul airport as there are two. IST is the main one- the 2nd one is quite far from city center- not sure if that plays into your planning but wanted to share. have fun!