Alexandra's place is in a great location, and Alexandra is an incredibly responsive host. We use AirBNB a LOT, and I'm not sure if I've ever had a host who was as responsive as she was. Lots of helpful suggestions and support getting there, and during the stay.
Her place is as described in words and in the pictures. Inside you have everything that you need. Its very clean and functional. Its also quite sparse. The simplicity is nice, but not as artistic as some AirBNB's.
This is THE place to stay if you're interested being downtown Thessaloniki. You can easily walk to historical sites and literally hundreds of restaurants. Its not a place to stay with a car. Parking is difficult.