I highly recommend this apartment.
The apartment is very spacious and luminous. High ceilings and big windows. It is on a higher floor in the building so there is plenty of sunlight. And there is an elevator.
The location is perfect. In the very centre of the historic city. 20mins walk from train station. 5 mins walk to Piazza Maggiore. The street was quiet (at least when we were there in August).
There are effectively three bedrooms. One of the bedrooms uses a double sofa bed (and it is a separate private room with doors), and the sofa bed was comfortable.. There is also a living room and a dining room, nicely furnished.
Everything was immaculately clean. The check in and check out was smooth. Elena and co were very attentive, helpful and straightforward, with good communication.