We had a nice stay in Joy's place! It's a nice small cozy apartment situated in an area with lots of shops which is great during the day for shopping and night for a drink or ice cream. It looks very safe but the latest we were out was 12 at night.
It'll take you about 30 minutes to walk to the Duomo if you want to see the city, but we took the metro which is a 5 minute walk from the apartment to the metro station and then a 5 minute ride. The walk from the Central Station to the apartment took about 15-20 minutes.
Although we didn't meet Joy, she was very kind in her communication and had given detailed info for our check-in.