I was recently for 2 weeks in Santorini, which is considered pretty expensive compared to the rest of Greece, and everything was actually very affordable (esp. if you learn to keep your distance from the more tourist-infested areas).
The whole time during my stay I kept thinking how nice it would be to work from there. Clear blue sky, beaches and fresh grilled fish. Wow.
High mountains, deep gorges (Samaria was the highlight), probably the best olive oil in whole Europe (but this is valid for whole Greece).
OK back to work, that dreamy look on my face is pretty revealing
Maybe off-season it's affordable. But combined with Mykonos it's an area where the term highway robbery comes ro mind.
Also maybe some bigger islands could be advertised on this way, although having to go through Athens for business trips might be a negative selling point (longer trips).
In general houses are very cheap in Greece. It is taxes and social security that raise the cost of living a lot. Last time i checked pretty much half of your income (actually a bit more) is lost.