We stayed at Live in Athens for two nights in our honeymoon. We had a terrific experience! The guys that hosted us were great--helping us with everything from the right metro to take from the airport to pointing us towards their favorite local bars and restaurants.
The apartment itself was very clean and cute! Great neighborhood walking distance from all the historical sights.
Our hosts greeted us with fresh Greek yogurt and cherries--yum!! They even did our laundry for us with no charge! What a great perk when you're traveling for multiple weeks.
If you're in Athens, I absolutely recommend Live in Athens.