I stayed in Chris and Katerina's apartment for a week and had a wonderful stay. The location is very convenient/walkable to the metro, center, grocery, restaurants, and museums/tourist spots. The apartment was very clean and modern, gets great light, has two balconies--one with a small table and chairs for relaxing/dining with a view of Mt. Lycabettus and a smaller balcony on the other side with an Acropolis view (which you can also see from the kitchen, bathroom, and bedroom). The wifi was good (I worked there while I was there with no issues). No problems whatsoever with the apartment. And--the special bonus: Wonderful hospitality. Chris was very responsive with any questions. There was wine, beer, chocolate, and cookies awaiting us. And even a homemade Greek salad, as it was a birthday trip for me! I highly recommend staying in Chris and Katerina's apartment when you're in Athens. You won't be disappointed.