I was approached on the street in the first few weeks by our Greek neighbor who asked me to come over to her house and help her daughter with English.  I was all for it; it would help me with my Greek as well!  The woman, Eva offered me 10 Euro an hour and I was blown away.  I didn't want to be paid, certainly not that much!  I kept saying "no, no, it's okay, no money, I'll talk to her for free!"  And Eva just looked offended and wouldn't accept me doing it for free.  I asked my roommate who is  Greek about this and she told me that if Greeks offer you something, you take it!  It's not like in the states where you might offer someone money or a ride home to be nice, but really you'd be relieved if they don't take it.  The Greeks offer you something and they want and expect you to take it.  So, I accepted the offer of paid English sessions with her daughter Alexia.  The last time I went, Eva offered me coffee and cookies.  I wasn't particularly craving coffee, but I said yes, please to her offer in a heartbeat, and enjoyed the coffee and cookies just as much as she enjoyed giving them to me.  The change occurred just when I was told about the difference in culture when it comes to offerings and gifts.  When I go home, I want gift giving to be just as genuine as it is in Greece.  When someone offers me something, I want them to actually want me to have it or take what they offered.  Same for when I offer someone something.