If you're planning to discover Santorini, not just staycation, choose Fira as your accommodation because it's the center of Santorini, so it makes you easier to explore around. And Katerina place is PERFECT!!! It's near the city center, near the white wall buildings (you will pass them if you go to Three Bells of Fira Church), near the cable cars if you wanna go to the volcano mountain. Many nice restaurants around so it won't be hard to find a place to chill while enjoying the sunset!!
Katerina was very attentive long before we came. She offered us many tours and airport shuttle service that really helped us. She also provided us with enough foods and drinks. There was a woman that will clean the place everyday so it was a plus! Not to mention the interior of this place, very unique, very Santorini ;) And oh we had chairs and table in front of our room to enjoy some morning tea :) Everything was just amazing. I highly recommend this place!!!!