Kostis was by far the best host we've ever had. He took the time to come up with a suggested program of activities, gave us great recommendations of restaurants to eat in and even went so far as to walk us to the Acropolis to show us the entrance. For a little more (and for cheaper than a taxi) Kostis picked us up from the airport and dropped us off as well. This made the whole experience very easy and we appreciated his flexibility. The location of the apartment is unbeatable. The museum is around the corner and Acropolis hill is a few minutes walk away. The apartment itself was very clean and tastefully decorated. You'll find everything you need (extra blankets, cooking utensils, etc.). We were also surprised that the fridge was full of water, juice, fruit, breakfast food, etc. Also, the view from the rooftop terrace was amazing. Basically, I think this is the perfect place to stay if you're going to Athens.