Lovely hosts! We didn't meet Piera as she was away, but her sister and her sister's husband helped us to check in and were really lovely.
The apartment is very sweet and nicely done up and we had everything we needed for our short stay. It's super central right in the heart of town and you'll be a quick walking distance from the Duomo and other sights.
Piera was super communicative and also recommended some great places to eat - including Cafe des Amis, where I had the best arancini I've ever tasted! Not to be missed. I would trust her food recommendations :-)
The only drawback that I'd mention is that it was pretty cold at night. There's a heater/air conditioner unit but it's not strong enough to heat the whole place up. It would be helpful if there was a second heating unit provided (even just an electric one that you plug in).