I really enjoyed my time at Domus Sicily. I stayed for a month in Feb and it was fantastic value for money. The flat is huge, airy with great outside space and I loved the position between the mountains and the sea.
I hired a bike and cycled to Mondello and Palermo ( Palermo is over 6 miles), the views from the road over the sea were to die for.
It may not suit someone who is not very active because wherever you go is a walk at best ( you could hire a car I suppose), but for active people a 20 minute walk to the beach is nothing. As I said, I really enjoyed it.