Just got back from Kef on Sunday - its honestly one of the nicest places i've ever been to.
Thanks for all the advice on this post! Glad to say we managed to visit, Lixouri, Assos, Myrtos, Fiskardo, Sami, Argostoli & obviously Lassi where we stayed. The underground lake & the caves were brilliant as was the 9am wine tasting at a vineyard in the mountains! I think Assos was the most picturesque place i've ever seen. I suppose we did as much as we could in a week!
Recommend it to anyone..we stayed at the thekla studios in Lassi, very basic but great for me and my girlfriend. We had use of the facilities at the Lorenzo hotel, so the poolside bar was very handy :-). Exceptional beaches, friendly locals, great bars/restaraunts, 32oC everyday - perfect!