The place is everything one could wish for (a washing machine would have been fine but there's a laundromat in the adjacent building so all's well). It is in the city centre but out of the beaten track (takes about 5-6 minutes on foot to reach piazza Santo Spirito), there's bus to and from the train station (number 11, and the bus stop for number 6 is pretty close, too).
The apartment is spotless, quiet because of the windows (when you open them it's kinda noisy because it's facing the street but once you close them, it's super quiet), the air conditioning worked like a charm (we only needed it for a couple of days). The place was well-equipped and I need to underline how marvelous the mattress was. I mean, there were days I felt like I didn't want to get out of bed because of how comfy it was.
Overall, a great find.
The only thing that could be a cause of concern in that the steps are very, very steep but they are like 30 altogether and it's just one flight of stairs that's really steep. The rest are mostly alright. Once you get the hang of it, it's not a big deal and can only pose a challenge to people with very reduced mobility.