What a great find! The appartment is in the perfect location, in a quieter street behind the Duomo. Everything is in walking distance, including the train station (10 minutes), which is great if you want to take a lot of daytrips.
The interior of the appartment wasn't really my personal taste, but I actually think it looks better in real life than in the pictures. Plus, everything was super clean and the place is huge. I was worried about the lack of airconditioning at first, since I have a lot of trouble sleeping in the heat. But with the ceiling fan and an extra fan on, I slept great (this was with day temperatures from around 34 degrees).
Communication with Jacopo couldn't have gone better. He always responded within minutes and did everything he could to make sure we enjoyed our stay. We arrived in the middle of the night, which was no problem for him. He even offered to pick us up himself for 20 euros (cheaper than a taxi), which was so kind, and he let us store our luggage in the building after the check-out time.
I would definitely recommend this appartment and host Jacopo!