The place is nice and cozy. The flat is kinda old and really tiny (I feel like it's the same size as the terrace). It's nice for two people (three would feel like a crowd already, I think).
The terrace is really sweet. However, it was too hot to sit there during the day, so I think it's a perfect stay for spring/fall/winter! George is sweet and agreed to check us in after 2 am and was always in touch answering our questions.
The location is ok, it's close to Exarcheia, walking distance to Lycabettus hill. But it's quite far from the city center, and verryyy far from the seaside. So if you're not a big walker you will have to take taxis or be at the mercy of bus drivers :)
overall, it was a pleasant experience!