We enjoyed a lovely stay in Ugo's apartment. The location is unbeatable, you can get anywhere quickly and are walking distance to a million restaurants and markets. As others have said, this means music on the square at night, but it always stops around 1am.
The terrace is lovely for a drink in the evening or sunbathing. In the hot Sicilian summer we appreciated the air conditioning indoors and comfortable beds as well as the nice shower downstairs. There were 4 of us so we had space to relax. However, one bed room downstairs does not have AC, but can be cooled ahead of time with the door open to hallway AC.
The kitchen is well equipped although we did not cook during our stay - too many nice restaurants and cafes outside the door! We had some issues with plumbing and cleanliness at the beginning of our stay but Ugo is a very responsive host who quickly came to fix everything for us without problems.