We were in Marsala for 4 days for a friend's wedding. We had a lovely stay at Casa Kina, it is ideally located in the city center of Marsala. You can walk there to every point of interest and restaurants/bars, and the bus station is 10mn away. The flat is very spacious, with a/c in the bedroom and the living room. We made good use of one of the 3 Italian coffee makers, and though we ate outside a lot, the kitchen is fully equipped to prepare your own meals and eat there.
We had a good communication with Gabriele to arrange for our arrival, and her friend Diletta gave us a warm welcome and provide a full list of recommendations for places to eat/drink in Marsala - all the ones we tried proved to be amazing (try the arrancine of Panaficio Ragona!!). We fully recommend staying there!