We visited Helen's apartment for three days after new year day. We were 2 families of 4 adults and 2 boys. The adults used the 2 bedrooms with double beds and the kids slept at the sofa-bed in the sitting room.
The apartment is completely renovated, very well decorated and fully equipped. Helen also added some Christmas decoration touches, she had breakfast, greek traditional sweets and a bottle of wine for us. She even had prepared a corner with toys and other kid stuff for our 4 years old son.
The apartment is very well located close by Thessaloniki's main square and in walking distance from most of city's main points of interest.
Although we did not met Helen in person, as she was out of city, her mother was at the apartment to welcome us and show us around the house.
I think that it is an excellent choice for large families or 2 families up to 6 persons, like us but couples will also enjoy the space and the facilities it offers.