The flat is in a great location- it’s a 10 minute walk to almost any of the museums and the main train station. It has a lot of space as well and was comfortable for 3 people.
I would take note that it is literally in the main square by the duomo and so it is noisy at night. Particularly in the front bedroom we bought ear plugs because there is constant foot traffic and the windows are thin. But if noise isn’t an issue for you then I would recommend. Check in was easy and it was really nice to be able to pop back to the flat at anytime since it’s so conveniently located.