The two of us enjoyed our stay at Katrina's and I'm glad we chose to stay here in Ortigia rather than Syracuse.
The location is perfect: easy to walk to from the bus or train, very close to great cafes and restaurants, a grocery store, shops, and sites, while still quiet at night.
Also, that terrace is beautiful! I wish the weather was better so we could have used it more. It's peaceful and the views are awesome.
We didn't spend too much time inside but found the couch and bed comfortable for reenergizing us.
The Ortigia tap water is a bit funky but that's a quirk of the area, not the place. It's like being on a boat. We bought big bottles of water to drink from the little grocery store nearby--super handy.
I also liked that Katrina was just upstairs in case we needed anything (we didn't but it was reassuring). She was also very nice and shared her recommendations for places to eat.
I would suggest staying here to anyone unless they suffer from vertigo or are unsteady on their feet as there are a few steps to the apartment and they are steep and not very wide--a character I think that's typical of the island.