The apartment is very centrally located (about 300m from the arch of Galerius, 150m from Agia Sofia).
The apartment is exactly as described and seen on the fotos. It has apparently been furnished and decorated with lots of love (the colors oft he sheets match the wall paint!).
The kitchen is fully equipped (there is even a stove) and coffee was provided as a courtesy 
The bathroom is tiny (as seen on the fotos), but functional and in good condition.
The Balkony is cute (also decoreted/planted with love) and has some really great views of Agia Sophia.
Heaters work well.
The couch – as most studio couches – does not make the most comfortable bed ever (and is not suitable for tall people).
Sandra was very friendly and gave as a warm welcome. She was very attentive, asking for sleeping arrangments in advance and always responded quickly (aslo when we were allready there and had a question). Since no other guests arrive the same day, she was also very flexible and generous with the check-out time.
It was a pleasant stay.