Just returned from two weeks at Kef Palace Hotel. What a wonderful place ! Don't go there if you want disco bars, take away restaurants, and the usual tourist trappings - there ain't any of that. What you get is a well run hotel, adjacent to to superb beach, with staff who are all super friendly and helpful.
Not sure if you have already gone, but just to advise its about a 20 minute bus ride from the airport down into Argostoli where you catch the ferry. In high season the ferries run every half hour and take approx 20 mins to cross the water to Lixouri.