What a little gem this is. Other reviewers have commented on the neighbourhood being a bit rough around the edges - it entirely depends on which way you approach the apartment. The suggested parking areas are, indeed, a bit run down and full of people who probably live on very little money, but it felt very safe and we experienced no difficulties as two single female travellers.
The apartment itself is small but very functional. We managed some basic cooking and found it a reasonable size for two people. It was very quiet and the bed was comfortable. As others have stated, the shower is quite small but perfectly functional, and there is plenty of hot water.
Daniele was a wonderful and attentive host who met us with a smile and good local suggestions.
Overall, we had a very pleasant stay and would highly recommend Francesco's place to other travellers in need of a central, basic, stylish, comfortable flat to use as a base for exploring Palermo and beyond.