I had a great stay at Sophia's apartment. It is small, but was what I needed for a short solo trip to Athens. All the amenities I needed were there, and the apartment is in a nice, safe part of the city. There are nice bars, restaurants and bakeries/cafes all a short walk away.
The only thing I would say is that it was quite a lengthy walk from the nearest metro station and from almost all the central sights. This was not a problem for me as I am young and was looking to do lots of walking on the trip - but others may find they need to use a taxi.
However, it was great value and I would definitely stay here again if I return to Athens!