The house is awesome, clean, fresh, has nice location and nicely designed. If you want to go there from airport, you can get there from Keramaikos station. But from other parts of the city, I'd suggest to use Metaxourgio station(Anthoupoli-Elliniko Metro), it's much closer. There are 2 markets(one is a supermarket) and 2 bakeries close to house. You won't be having trouble finding anything you need.
The balcony is really nica and refreshing. It's really nice to have breakfast and drink greek coffee in the mornings and drink beer at nights.
There's a small tavern, Metaxou by the next building, with a cute garden. It's open only at weekends. They play amazing traditional Greek music. It's run by really warm people.
The landowner, Andrew is really helpful, not only in house matters, but in every aspect. He helped us a lot for exploring both Athens and Attica. If you follow his advices, you'll absolutely have great time around. He really likes to keep his house clean and neat, so you feel really comfortable. The whole decoration is made by himself, entire house is like an art gallery.