We stayed at Alexander's flat for 5 days and we really enjoyed our stay! The flat had everything we needed, and it was very clean. Alexander responded very quickly whenever I wrote something, so it gave us the confidence that if we need something, he will be able to respond right away.
It may no be the quietest place if that's what you're looking for, but it comes with the beauty of being at the very heart of Thessaloniki. Super central, great location.