I had a very nice time at Niko's place, and he himself is a very nice host. He was waiting for me at the station and showed me the apartment, so friendly and helpful.
The neighborhood is one of the nicest to stay in Athens, walkable distance to the city center (but his apartment is well secluded from the noisiest streets in the hood) nice bars and restaurants close by as well.
I recommend and I would definitely stay there again.