I spent almost 2 months in Kostas' flat, and I can recommend it without any doubt.
Kostas is a perfect landlord: he gives you the best advice about the city, he is available for any necessity and if there is a problem he is ready to solve it.
The location is perfect: nice neighbourhood, you can reach the centre in 40 min by walking or 20 min with the bus that passes each 15 min just 50 meters outside the flat.
The flat is clean and cozy, provided with all the necessities, a big bedroom and a comfortable living room.