We really enjoyed staying at Nick's place in Athens. It is located on a quiet street in a good area and is close to nice cafés and restaurants. It is also within walking distance from the acropolis. The room itself was clean and modern, with a comfortable bed and good airconditioning unit. After a couple of weeks of traveling the private bathroom was amazing as well.
The front door of the building is a bit tricky to open, so make sure you listen closely to Nick when he's talking about it.
We would definitely stay here again if we go back to Athens!