Costs
The strength of the EURO will make perhaps the biggest difference to foreign visitors, but even then Greece is, by regional and global standards, fairly inexpensive as a European destination.
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At the budget end (staying in hostels or Couch Surfing, rarely eating out, walking and visiting mostly free sights), you might be able to get away with about €30-€40 a day.
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A more average budget for most visitors (staying at standard hotels, AIRBNB or family run guest houses, eating out once a day, going to the full range of sights and taking public transport), would be around double that, at €60-€80 a day.
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Double that again and over €150 buys a pretty high-end experience, with smart hotels, meals at the full range of restaurants and taking taxis around town whenever you feel like it.
Note that these are over estimates–Greece as a country is pretty inexpensive and it’s possible to get good deals at mid-range to luxury places where meals can be included.
Note too that traveling solo could raise any of these per-person-costs by at least a third for all except budget travellers.