I can really recommend Manolis apartment. It is the perfect calm and relaxing place to come back to after a long day of walking and exploring a city, that is fantastic but also very lively and can be exhausting. I can also highly recommend it with children. Ours very much enjoyed the pool, they went there twice a day! You have a nice place to stay, sleep, cook, eat and relax. The apartment is in a good location, four metro stations in 5-10 minutes walking distance. Manolis gave us useful tipps: a very good restaurant and a nice cafe at a little square right at the next corner. It is very calm in the apartment, even though it is pretty much in the city center, as the apartment is in the fourth floor and the windows have good isolation.
Manolis was a perfect host: we could not met in person but it was no problem to pick up the keys at the corner shop. the apartment was clean and everything there we needed.
I wich I still was in Athens, it was wonderful, mostly due to a perfect place to stay.