In brief: very good value for money, recommended.
The apartment is very spacious, very clean and seems to be more or less brand new. It is equipped with everything a traveller might need , even a washing machine, and a very fast Internet connection. There is free parking in the street, an very important asset in Palermo if travelling by car. Porta Nuova, the southern gate to Palermo's Centro Storico is a straightforward and easy 15 minutes walk from the apartment.
We faced a little hickup at check in, which was solved once we called our contact person at Welcome to Italy.