Another three to consider -Turunc, Dalyan or Akyaka. The scenery around all of them is spectacular and they are all quite small resorts. Dalyan is probably the biggest and most developed but the setting by the river is wonderful, of the three this resort has the best beach. It is protected because loggerhead turtles nest there, so it is accessed by boat. The trip to the beach in itself is a great experience. Akyaka is very uncommercialised, and is the quietest, it has a lovely beach, but the village and restaurants are a bit more spread out than Turunc. Turunc is very compact and the low-key nightlife revolves around the restaurants and bars in the main street which is pedestrianised at night. Nowhere is more than 10 minutes walk away, but there is still more than enough choice of lovely restaurants and bars for a two week holiday. Its the sort of place where you get to know the bar and restaurant owners and waiters, and other holidaymakers, which makes for a lovely friendly atmosphere. There are a several small family run hotels and apartment complexes which would probably suit them. It's also very easy to get around by taxi boat, dolmus or on organised trips. It is also possible to walk over the cliffs to Amos and Kumlubuk, which are the next two bays to the west. Marmaris and Icmeler are both within easy reach if you want shopping or a lively night out.
To give them an idea about the restaurants here is a link to my post from last year
http://www.holidaytruths.co.uk/viewtopic.php?f=28&t=135360
As long as you do a lot of research you will be able to find the resort that suits them. There are some very big brash, commercialised resorts which are probably not for them, but there are also many which offer exactly what you have described.
Hope they have a good holiday!