The flat, while small, is wonderfully located in the Exarchia neighbourhood. So with all the beautiful shops, cafés and restaurants around, you will be spending most of your time just wandering around the streets, taking it all in. : )
And on top of that, the hosts will be very gracious with their tips and advice. They regularly sent me suggestions for interesting, off-the-beaten track places and events, which were most appreciated.
For anybody who is particular about it, the place was spotlessly clean and tidy, beyond even what a regular hotel would offer.
So I can freely give it 5 stars in all respects.
:)