We stayed for 35 days, the longest stay we've ever done. The place is roomy and can easily fit three. The kitchen is well supplied with cooking utensils and some nice touches like tin foil and wrap. The TV is reasonably sized, lots of surfaces to use and plenty of "open storage", sort of like closets but using curtains rather than doors. The bathroom is massive. It really is just a nice big apartment. The turtles which roam around the court yard are a nice touch and the court yard is really lush and pretty.
The apartment is near a bus stop that takes you from SMN (main station) to Fiesole. Fiesole is an nice town with a good grocery store, where we often shopped. You can also go into SMN and pick up supplies literally feet from the bus stop.
If you happen to be afraid of dogs, I would not suggest this place, while the dogs are upstairs, they are near enough for those truly afraid. That said, that isn't us. The dogs also tend to make noise early in the morning. While it isn't too loud in the bedroom, if you are a light sleeper it might impact you.
The other possible issue is the water pressure in the shower. It isn't great, but it varies from good to poor for no apparent reason.
Early on we had an issue with not getting any hot water. Alessandra was on top of it and got this fixed with in a day, and she let us use her other shower which was working for the one day the water was broken. We also unfortunately broke the back of a chair and Alessandra didn't seem to mind, telling us not to worry.
Overall, I'd recommend this place for a short or long stay.