The apartment is very nice, although the building might look a bit scary. Being on the 6th floor with no lift, it is only suitable for young and energetic people. Besides, it's in the old part of the city, which means you'll have to walk up (I think there are busses during daytime anyway). Once you finally get there, you'll enjoy a very nice view of the city. It's also quite easy to reach all the nice places you should see, Thessaloniki is a small city and you can basically walk anywhere, we never took busses, expect from and to the airport. Overall it was a very nice experience and we will definitely want to stay again at Marta's apartment!