We loved it! Our host wast prompt at the arranged meeting time, and check in/out were a breeze. Overall, we were very impressed. I'm guessing Toni has experience in the hotel industry because his operation seems to be really professional and smoothly run.
The flat was very clean, stylishly furnished, and more spacious than we expected. There's no squeezing between the bed and the wall like in a typical Athens hotel room.
All the furniture and appliances were in good shape (including the two air conditioners, which are critical in Athens!). Also, being one block back from the main roads there was very little traffic noise. The location is right in the heart of Thissio, which is a safe, wonderful area with lots of cafes and a wide pedestrian street. It's also just a few minutes walk from the metro station and taxi rank.
The only real criticism I had was that there was no washing powder for the laundry machine, so we bought some for 2 euro at a nearby market. As you can imagine, if that's the biggest problem you have in a two week stay, it makes for a really enjoyable time :)
We come to Athens ever couple of years, and we definitely plan to stay here again, if possible. Great job Toni & crew.