Katerina was a wonderful, friendly, helpful and patient host and I highly recommend the flat, which is clean, nicely decorated, well located and with a nice front balcony to sit in the sun and people watch.
After a horrendous start to my trip due to a snow blizzard that cancelled all flights from the UK and shut the local airport for 2 days, and a very long delayed journey via various stopovers, Katerina met me in the middle of the night to let me check in - with a big bar of delicious Greek chocolate! Throughout the stay, Katerina was in contact to check whether we needed anything, and to offer information/tips as required; and on our last day her dad very kindly took us to the airport - free of charge - to save us having to arrange a taxi.
For us the location was perfect - only a 20 minute walk to the clinic where I needed to visit, 15 minutes to Lidl, a market right outside the flat every Tuesday morning, 2 minutes to the seafront, and about 20 minutes to the lovely marina and the strip of bars, cafes and bakeries along the seafront. There is a bakery just round the corner selling delicious cakes and friendly staff, and bus stops for buses to/from Thessaloniki town centre just round the corner.
Kalamaria is a lovely place and I would recommend it for a stay in a "real" Greek town.