The apartment is located in a great spot, close to nice restaurants and cafés. The place was clean and beds very comfortable. Alessandro is a friendly guy – speaks only Italian but the communication worked well anyway.
One minus would be that the rooms weren't cleaned upon check-in, Alessandro did the cleaning when we arrived. He did let us stay longer on the day of check-out though to wait for our flight, which was nice.
We went to Palermo for a working holiday, but as the apartment next doors is a building site, there was too much noise during the days to be able to focus properly. If you have trouble sleeping with noise, it might also be worth knowing that the central location means there is quite a bit of noise from the street at night (the trash pickup will probably wake you up every night).
In general, we enjoyed the stay. Thanks Alessandro!