Athens is not a Special Needs-friendly city. In fact, it is a disgrace that even the disabled residents of the city itself face a nightmare whenever they need to leave their home. In theory, authorities try to make their lives easier by constructing wheelchair and blind-person friendly pavements but, in practice, all these vital aids for the disabled are rendered useless by insensitive car and motorbike drivers, who park their vehicles in every last inch of available space imaginable (including right in front of wheelchair access ramps), making the life of even non-disabled pedestrians a living hell.
Restaurants and public buildings are obliged by law to offer easy access and specially adapted toilets for the disabled, but then again, you are in Greece and many laws are there to be broken...