I had a great 1-month stay at John and Raffaella's place. The flat has a really homely feel and especially the bedroom is very spacious. The kitchen is quite small but sufficiently equipped and with a good gas hob (I didn't use the oven). There's a nice roof terrace off the kitchen to enjoy the good weather. As it's a top floor flat without a lift, there are quite a few stairs to climb which is a good workout - though if you have mobility issues this probably isn't suitable for you.
The location is great in the middle of the Mercato del Capo in the historic centre.
If you're unlucky to get noisy Airbnb neighbours next door, you might hear them in your bedroom where there's a locked door connecting the flats.
Just to note that the flat can get quite cold in the winter and the small electric space heater doesn't really warm up the place very fast.
Communication with the hosts was good.
Overall, I would definitely stay here again!