We had a lovely stay at Roberto's, the apartment was larger than we thought and we had everything we needed in the kitchen. Roberto was super nice and waited for my (very) delayed flight to do the check-in.
It was also very convenient for exploring Palermo on foot (right next to the Palazzo Reale). The only minus is that the mattresses weren't super comfortable and that there was quite a bit of noise at night, although that might be a Palermo thing. Would definitely consider staying there again and can recommend it to everyone.