I hired Byzas tours to bring me to both Ephesus and Cappadocia from Istanbul because I only had eight days in Istanbul and did not want to waste any time organising it all.
I found them to be affordable and flexible. I got to do what I wanted to do when I wanted to do it, but all I had to think about was being in my hotel lobby at a certain time. The guides were educated and interesting to talk to.
Some websites suggest doing things yourself, but there is so much history in Turkey that only a guide can put it in perspective (unless you plan on carrying a library with you).
Also, I compared Byzas' prices to the cost of doing it all myself separately, and it barely cost any more ... it might have been the same with all the things I didn't have to worry about such as highway tolls.
Send your feedback or queries to been.there@guardian.co.uk
Search Been there