I had an amazing stay at Ioulia's apartment. It's perfect for 1-2 people and in spite of the central (Kolonaki) location, it was extremely quiet. Lots of fantastic restaurants, bars, and shops in the immediate vicinity and a relatively short walk to Syntagma as well as bus and metro stations. The apartment was immaculate, with good A/C, nice bathroom, and a well-equipped kitchen. Highly recommended.