We lived in Stamatis' place for a month and a half and it was a lovely experience. It is located in the heart of Thessaloniki (doesn't get more central than where it is), something that makes it ideal for tourists as well as people who need to commute everyday by bus to go to work (there are a lot of buses passing through the city centre).
The apartment itself is very ergonomic, sunny and bright and the kitchen includes most utensils a traveller may need. Additionally, there is a big balcony with wonderful view, connected to both the bedroom and the living room.
Finally, Stamatis was really helpful and always ready to provide everything we needed. He made it clear how important it is that our staying is not disturbed by any negatives factors. He even had window screens installed upon our request, so we can enjoy the mosquito-free fresh air!
Thanks for everything Stamatis!