This is a beautiful, spacious apartment on the top floor in a great neighbourhood! Four of us stayed for three nights in early July (during the European heat wave of 2019). The apartment is exactly as it appears in the photos, except that it is much bigger than it looks :-) It is very comfortable; has everything you could need; is very quiet with almost no street sounds making it through the formidable windows; and of special note for us, very well air conditioned. There is an elevator in the building (which is often not the case in old European buildings).
And Marzia is an incredibly good host! She was very responsive and helpful both before and during our stay; she provided all kinds of advice and recommendations, and booked transportation to and from the apartment for us.
I would not hesitate for a moment to book this apartment again -- or any of Marzia's other places. Just an amazing experience all around!