I had a very good experience at Caterina's listing. She was very responsive and flexible with my arrival. Helped with the bus routes from the airport and directions to the studio. Her son was at the place when I arrived, showed me the place and amenities as well as giving me recommendations for where to go out for a drink and food. The one exception I have regards a filter/electric pump they have installed for the shower and toilets, it randomly turns on and makes some noise, which during the night could bother some people who are sensitive to noise.
Other than that it's a great place and I definitely recommend it, especially if you are looking for a place that is accessible to the center of Thessaloniki and all its transportation routes - buses, trains and fairies :)