The first course i would recommend would be TÖMER. TÖMER has a total of 11 branches around Turkey: Ankara Gölbaşı, Ankara Kızılay, Ankara Tunalı Hilmi, İstanbul Taksim, İstanbul Kadiköy, İzmir, Bursa, Antalya, Alanya, Trabzon and Samsun branches. Among these the smallest cities are Samsun and Trabzon. You can also opt to Bursa or Antalya Alanya but as Antalya and Alanya are the places which are heart of tourism maybe you would not like there as it would be crowded. Detailed info : http://www.tomer.ankara.edu.tr/english/index.html
And the second one could be TAA (Turkish American Association ) Turkish courses which can be in Denizli, Eskişehir or Antalya except İstanbul, Ankara or İzmir. But As these branches are new maybe not all the courses are available in all cities. You can confirm the availability of courses from the phones and links at : http://www.taa-ankara.org.tr/eng1/turkish-courses-turkce-kursu.php