We had a great stay in Katerinas apartment. It is located near the Muzeum and the main railway station. Even though it's central it was very quiet since the balcony/window is faced towards the inner courtyard.
Having both an AC unit and a balcony was perfect, even though it was a bit rainy/cloudy during our stay.
The apartment is located at the top of the building, but don't worry - there's an elevator so you only have to walk up a few sets of stairs ;-) The check-in process was very smooth and easy.
The apartment was beautifully decorated and the bed was very comfy. The only downside was the bad water pressure in the shower, it resulted in me having to shower for a lot longer than necessary just to get the schampo out of my hair properly. Otherwise everything was great!