We stayed for several days with short notice. Damian was helpful and obliging organising to meet us, given our delay.
It is perfectly located to explore Palermo Soho, with excellent dining & shopping options nearby, (highly recommend Ninina for brunch & La Hormiga for lunch or dinner).
The apartment is basic, functional, secure and quiet, being located at the rear of the building. My partner commented that it's "a boys" apartment, as it's 'no frills'. Wifi was easy and worked well. We didn't cook or eat in. We found it clean and tidy but I have an acute nose for cigarette smoke, and could smell it faintly on one pillow (which I didn't use) and a hint in the apartment (my partner didn't notice it). A dry-clean and an airing would resolve it.
Conversely, the hot water was hot enough for me but not for my partner. One other thing, the gas heater was tricky to re-ignite.
As mentioned, it's location was the big plus and Damian was easy to deal with. The minor issues can be easily resolved.