Inter City coach travel in Turkey is safe, reliable and comfortable. All major towns and cities are serviced by a number of national and local bus companies.
Have a look at Metro
who have a home page in En glish but the timetable and price details on the next page ar ein Turkish! However, this will help I'm sure:
Kalkıṣ Saati = Departure Time
Varıṣ Saati = Arrival Time
Liste Fiyatı = List Price
Internet Fiyatı = Internet Price
This site shows the following travelling times and prices:
İstanbul - Denizli (for Pamukkale): 10 hours. 50/65 Turkish Lira
Denizli (Pamukkale) - Nevşehir (for Cappadocia): 10/11 hours. 50/60 Turkish Lira
Nevşehir - İstanbul: (10/11 hours. 45/55 Turkish Lira
A local bus running approximately every 15 minutes will take you the 11 miles from Denizli Bus Station (Otogar) to Pamukkale Village.
Nevşehir is ithe principal hub for visits to Cappadocia, but maybe lacks the charm of Göreme and its proximity to the Open Air Museum, Zelve and fairy chimney landscape has made it a popular choice for accommodation for many years.
Ther are othe bus companies, of course, such as Ulusoy
and many others.
Do let me know if I can help with more detailed information.
Enjoy your travels and, Martin, the funny photos will