I haven't had experience chartering there but I have sailed there a number of times including 4 months on this boat.
I don't have a lot of faith in some people in business in that country.. There is little to stop them taking advantage of a foreigner. Consequently I would only charter with one of the big international companies.
Sunsail have bases there. I think I would be checking them out.
Every anchorage has its restaurants and touts that try to get you to use their moorings, they tell you anchoring is not safe there etc...
I don't want to eat in a resturant where they lie to get you in the door. So weirdly, and in not many countries would I say this, but the charter companies guide book may be the way to work out where the "approved" places to go are.
However, when you can anchor
yourself and go into a town you will be away from all their clutches and will be able to find great places to eat.
To a degree you must remember that Turkeys coast is a tourist thing.... The real locals are not the people you will see till you get deep into the town away from the tourist areas.
My favorite places stretch right along the coast, but probably most between Marmaris and Fetheya.