I'm in Greece right now, and have been here a few weeks. There have been no difficulties in traveling. Hotel prices have been quite low, and even the cheapest ones are usually quite clean and nice. Not sure what your schedule is, but around August 15 is a big religious holiday and everyone goes back to their villages--I was in Thessaloniki for this one year, and it was like a ghost town, totally empty. We found only one restaurant open.