There are many four and five star hotels in Athens such as the Andromeda Athens (a five-star hotel), the Hotel Grande Bretagne (four stars), and the Herodion Hotel (four stars). One hotel, the Divani Acropolis Palace Hotel, rated five stars, sits under the shadow of the Acropolis. Another Divani five-star Hotel, the Divani Apollon Palace, is situated along Greece’s many miles of coastline. There are also many other places to stay in Greece, such as Mykonos, known as the best island in Greece, and Santorini, known for its beautiful sunsets, each with their own share of first-class resorts. Making a reservation at these hotels for a prolonged period of time (two to three days as a minimum) is sure to cost a lot of money (at least €1000 [1000 Euros])
(Of course, you can always stay at a chain of hotels, such as Best Western.)