Effie was very welcoming and available, always prompt to answer any messages or questions I sent her over the app.
For any other Americans out there: first floor means up a flight of stairs. The apartment is over a PC lab, and the fish guy next door knows about Effie's rental and will point you in the right direction if you get lost.
The rental is within walking distance of two metro stations that will get you pretty much everywhere you need to go: the airport, the acropolis & plazas, and piraeus, the port for all the islands.
The air conditioner in the living room is pretty worthless, but the one in the main bedroom is excellent; it can cool both bedrooms if you leave the doors open and the hallway closed.
Couldn't figure out how to work the oven, but maybe that's just my American unfamiliarity.
Microwave had a tendency to blow the circuit, had to reset the breaker a few times.
Beds are very very firm. One of the children's beds squeaks a lot.
Overall I was happy with the host, the property and price. Would definitely recommend.