This is a lovely, well-maintained property with everything you need for a short stay. Great views from the balconies for when you want to stay in, central location in village for when you fancy a little wander. Three tavernas, a cafe bar and two mini-markets all lie within a couple of minutes of the house. Two small, stony beaches are both a very short stroll from the front door - a lot of Kefalonian beaches are stony so don't let that put you off Assos!
The sea, when we stayed, was warm and crystal clear.
On the downside none of the dining-out options in the village are much good - it's basic tourist fare. We were disappointed not to be able to get good Greek food without leaving the village. The roads into and around Assos are pretty hairy and not something to be tackled unless stone-cold-sober. We wanted to enjoy wine with our meals which meant we had to make a choice between ho-hum, overpriced food with drink or better food minus the wine. Taxis are an option but we found them exorbitantly expensive. There's a lovely, friendly restaurant a couple of miles outside of town, Vegera. We got a lift there and a taxi back cost us 30 euro, almost as much as the meal!
Overall though Assos is lovely and Thalassa is a great place to stay.