Just back from 7 days in Kefalonia at the Lefteris appartments in Lassi,although the appartments are basic with no frills they more than do the job in my opinion. Absolutely stunning views from the pool area and all the appartments look over beautifull scenery.
Be prepared for a hike up to the appartments it is very steep and probably not ideal for the elderly or infirm, but taxis are abundant.
Try and hire a vehicle as the island is amazing especially the north ie:Myrtos beach, and Assos. Overall a wonderfull island with the Lefteris appartments providing a reasonable level of comfort and views to die for...!