Maria was a very helpful host and it was easy to communicate with her. Her place is compact but comfortable and suits a single person well (or a couple, especially for a shorter stay). The only downside is that the configuration of the small kitchen is a bit awkward so it's really only suitable for some simple cooking. There are plenty of great restaurants in the local area though!
The location is great in the middle of the lively Kerameikos neighbourhood which is also within easy walking distance to the more touristic, central areas. The nearby metro station is on the direct line from the airport.
Overall, I recommend Maria's place and would also stay there again.