I am planning a long and quiet holiday in Turkey, and looking for a cozy city around Istanbul. Since I arrive at Istanbul airport, I wish to find a nice city around Istanbul (less than 200km far) to travel with bus. I prefer European part of Turkey, but I was unable to find a popular destination there.
Do you know a cozy and cheap place around Istanbul? And how can I find an apartment there before arrival (online websites and booking are mainly for major tourist destination like Istanbul and southern cities)?
UPDATE: I do not care about common tourist attractions (like beach, mountain, etc). I just want to have a relaxing holiday while I study and work with my computer, and occasionally walking around. Requirements are only:
Good accessibility from Istanbul airport.
Availability of apartment for short-term rent.