The apartment is located centrally, the main attractions, the sea and the Ano Poli can be reached by foot between 5 and 20 minutes. There are plenty of bakeries, coffee places, restaurants and little supermarkets in close proximity. We were here with a 1 year old child and a stroller and had no problems getting around.
There is an express bus from the airport to nearby Aristotelous place which takes about 45minutes.
The apartment is on the 6th floor and there is no elevator, which was not a problem but should be taken into account if you have very heavy luggage or mobility issues - however, we knew this before and Augusta made us aware of it again.
The apartment is very well equipped also for staying there with a child, there are two baby chairs. One of the two balconies is usually sunlit and there were even two lounge chairs you can put up there.
Augusta was not there to greet us in person (but send a friend) but was always available via AirBnb/Whatsapp and very friendly, helpful and accomodating. Should we return to Thessaloniki (very possible!) we would come here again.