This was a gem of a place! I loved everything about it, including the location, the old stone walls, the winding staircase, and the rooftop terrace. The beds were incredibly comfortable. It did get chilly at night because of the thick stone walls, but there were plenty of extra blankets.
Jackie was excellent to communicate with and provided information well in advance of my stay. She even provided some basic provisions in the kitchen including milk, fruit, fresh bread, and a large bottle of water, as well as a good assortment of herbs and spices for cooking.
Note that there are a lot of stairs in this apartment, with the kitchen at the top, so if you have trouble with stairs this is probably not the place for you.
If I ever visit Malta again, I would stay at Jackie's place in a heartbeat.