Caterina was immensely helpful!
She replied fast to every question and was very flexible.
Her place was quiet and very well located. We could walk to every attraction within 20-30 minutes and after a long day we could take the bus which has a station nearby (~3-5 minutes walking)
The beds were comfortable. I would recommend this place to everyone.
The only problem was with the elevator, which works a little strangely.

TL&DR: this was an almost perfect experience for us and I'd recommend Caterina as a host and her appartment for everyone.