Great place to stay! Very close to Aristotelous Square. Everything is at walking distance. There are super markets, flea market (bit pazar), food market (kapani - if you are looking for fish, meat, vegetables, etc.). very close to the building. There is a bus stop about 20 meters and also a taxi stop about 50 meters from the front gate. There is also a nice café on the corner.
Wifi connection is great and there is a wide screen TV with Netflix. There is an espresso machine as well as all the kitchen utensils you might need.
Last but not least, Giannis is the man! He is a very nice guy and always checks on you to see if your stay is OK. Next time I am in Thessaloniki, I am at Giannis's place.