Nestor was a nice host, very helpful and friendly. The apartment is exactly like in the pictures, comfortable and modern, although there could be some more furniture, I guess the furnishing process is still ongoing.
Nestor even arranged a taxi for us for the way back to the airport, which was very convenient.
The neighborhood was okay, we found several bakeries and small shops. It's not the most central, but it is a 20-30 minutes walk from the touristic part of Athens.