The place is very well located especially if you want to use Caltanissetta as a camp base for a couple of days and travel to Agrigento or Cefalu.
The house is comfortable. The (inside) common spaces, however, are a bit small if you are going with a big group (we were 10 adults). I cannot say the same with regards to the outer terraces which are big and comfortable.
Note that Marco's grandparents lives in the house. However, they are very nice people and in no way affect your independence.
Marco was a very good host, fully concerned about our welfare during our stay.