If this place is available, book it right now. You will not regret it.
Location: ideal - the entire city is walkable from this apartment, there are great restaurants nearby. It's safe, quiet, and convenient.
Condition: this is wonderfully clean, spacious and well-appointed. When travelling, a new city always provides so much stimulation (sights, sounds, smells, language...) that coming back to a crisp, minimalist flat is delightfully soothing.
Hosts: Marta's parents met us to let us in, and were so kind and welcoming! They will help you with whatever you need.
We stayed for a full month, and having laundry in the apartment, a kitchen for cooking, and multiple spaces to hang out was a great luxury. If/when we return to Palermo, we will choose our travel dates based on the availability of this apartment. Enjoy!!