Our family of four just spent a week (Friday to Friday) at this apartment and can't say enough good things about it! The location is great. Super convenient to walk all over central Athens and also close to Acropolis metro and several bus stops. If you buy a 5 day pass like we did you can hop on and off transport whenever you need.
The apartment itself is very newly renovated and very clean. We really appreciated that Panos and Nadia had left us some food and drinks which made arrival seamless. There were toiletries in the bathroom (we had our own, but it is good to know they have individual soap/bath gel/shampoo lotion like in a hotel!) We had been traveling for one week prior to arriving so first thing we did was ask how to use the washing machine so we could do laundry and put it on the drying rack and get out to explore.
The apartment is on a very busy street but very quiet thanks to the electric blackout shades which are on the outside of the windows and made of a metal material that blocks sound and light. There is a wrap-around terrace (which we didn't use b/c it turned out we were in Athens during a rainy spell) but it would be nice in good weather.
There is a small supermarket nearby and a number of mini-marts, and if you are returning a rental car it is very convenient as many of the big rental companies are right there on the block or the next block or two over.
Highly recommend this place and would stay there again!