This flat is located in the Victoria area of Athens. I spent three weeks there in February-March, mainly for working purposes. The flat was clean and entirely satisfying, and will easily suit a couple on holiday, though with kids one would need an extra bed solution.
The metro is about five minutes walk away, and the laundry about three. There is a small supermarket about two minutes away. In spring and summer there is a nice back yard where one could spend a lot of time.
I did a lot of walking during my stay, and there are plenty of nice places to hang out about fifteen minutes walk to the east and northeast. Walking to Acropolis will take you about 45 minutes, but as said the metro is close by and an option too.
One can be quite self sustained staying here. A new stove with cooking plates was installed whilst I was there. The hostess was easy to get hold on, and communication was not a problem. If you like exploring cities, and do not need to be exactly next to the most known tourist spots, this is a good solution for staying in Athens.