We enjoyed our stay at Ada's place - it's fantastically located in a central location just a couple of minutes walk from the Duomo.
We didn't get the meet Ada but she was responsive to our messages and organised for her mother in law to be present for our check-in whilst also leaving a helpful notebook of tips for us to peruse.
The apartment is clean and well stocked with basic amenities, and we would have no hesitation staying there again!