The apartment is absolutely perfect for a few days!
First of all - the location is fantastic. The neighborhood itself isn't too touristic but it's very calm and only 5-10 minutes by foot to bars/restaurants and the city center.
We stayed in March so we did have to heat the room which worked just fine and is easy to use. The window opens to an inner courtyard which makes it very quiet and there is an opportunity to hang laundry in front of the window to dry it. The bathroom is very small but nothing is missing, the shower is quite roomy though and has a movable showerhead and rain shower! Unfortunately the walls are very thin and you hear everything from the hallway and sometimes noise from other rooms when something fell down or the water is running. Wasn't a problem for us though as there wasn't a lot of noise (and I've heard that thin walls are very common in Athens!) All in all, the room is rather small but it was enough for two persons / four nights, especially for the price!
Sokol is an incredibly nice host, he organized taxis from and to the airport for us and always helped us super quickly when we needed anything!
We'd love to stay again if we're going to Athens a second time :)