The house (so no one is above or below you) is at a wonderful location close to Larisa Train - metro Station (at most 6 minutes by TAXI).
The place is great and the neighborhood is a family oriented one, hence it is really quiet at night. There is a beautiful Greek orthodox church nearby (2 minutes walking distance), a couple of supermarkets within ten minutes walking distance, and quite a few cafes/pubs. The metro station is about 20 minutes away on foot so the whole of Athens and adjoining areas are within your grasp.
There are a couple of stairs before and after the main entrance. (it is correctly mentioned by Tasos)
The place is heated/cooled by 2 ACs (1 in the bedroom, 1 in the kitchen/living-room.
It was very clean and there are extra pillows/ blankets in the bedroom.
The rooms are very spacious and for their price offer a great value. we never once felt like we didn't have enough space for us. (there is enough to play football in the kitchen).
There are also two doors that lead to the floor above which actually is open space (terrace).
There is a heater dedicated for warm water for the bathroom which is switch operated.
The kitchen was fully equipped with anything needed to prepare any kind of food.
Tasos was readily available when we needed to ask through the airbnb website.
All in all, it is a great place to stay near a very central location of Athens with a great Host.