Alexandra was an excellent host. She informed me how to get easily from the airport to the apartment (bus X1 stops 5 minutes from the place).
Also on arrival the place was very clean and exactly as shown on the pictures with all facilities available (she even put water and a welcome beer in the fridge).
Communication was flawless (within the minute replies most of the times) and everything was taken care of.
Apartment is right in the middle of the center with stores and bakeries just 100 metres away, so you can easily prepare a daily fresh breakfast.
As my return flight only left late in the evening, Alexandra offered to keep my luggage until departure so I could enjoy my last day fully in Thessaloniki, and eventually she even offered me a lift to the airport :-).
Will recommend this place and host to everyone I know.