The Greece hotel system currently uses a letter ranking for accomodations. An L is a five-star hotel while an E is a no-star hotel. They are slowly replacing the letter system with a star system, however. In addition, the rating system is not always consistent. There are many D-class hotels with better amenities than a C-class hotel. A C-class hotel is only required to provide a simple continental breakfast and they may charge for the service. A B-Class hotel usually offers a complimentary buffet breakfast.
Dhomatia, usually rooms for rent in a private home, are prevalent in Greece. The room itself is usually very simple with nothing more than a bed, a hook on the door and a bathroom outside the room. However, the hospitality you receive from the family will more than make up for the accommodations. Some do have amenities like balconies, pools, bars and playgrounds while others offer kitchens and sitting areas.
Villas are also popular in Greece. You can find villas that are small cottage-type homes to luxurious homes with beautiful views, multiple master suites and beautiful living and kitchen facilities.
You must have a passport that will be valid for at least six months beyond your stay. United States citizens may enter Greece without a visa as long as they are staying for 90 days or less for tourism or business. You may be asked to prove that you have sufficient funds for the trip and that you have a return airline ticket.