We stayed at Vero and Clara's place for 20 days whilst visiting friends and family. I'd say the flat is ok for a short term stay. I wouldn't recommend recommend staying more than a week.
Location is good, walking distance to many restaurants, bars and shops in Palermo and also well connected via public transport to other points on the city. The flat is located on a floor close to the street so if you keep your balcony door open it can be a bit noisy but during the night it wasn't an issue at all.
The quality of the bedding was very poor. We had issues with this and we contacted the host but we weren't able to solve this, and whilst she sent new bedding and towels these were also very noticeable stained and in poorly condition. I wouldn't give bedding or towels in this condition to anyone staying at my home, let alone at someone who is paying for it.