Kostas was very responsive and very helpful. He was unable to personally pick us up at the airport but his friend helped out. Kostas gave us a very detailed map of Thessaloniki. It showed places to eat and places to visit. He, also, took us to lunch for some gyros when we arrived.
The apartment is right in the city. Perfect location to walk to shopping, eating, museums, and the water front. However, if you are wanting a beautiful view, this isn't your place. It's in a apartment building with views of other apartments and their balconies. The location is prime!