We had a great stay at Nikolas's place, which is located in just about the perfect spot in all of Athens: right at the midpoint between upscale Kolonaki and hip Exarcheia, and an easy enough walk from all the attractions in the city center. The apartment itself is gorgeous, spacious, and peaceful. Everything worked well and went off without a hitch. The balcony is a lovely place to sit in the evening, when Athens isn't too hot. Highly recommend!