BOOK IT!! The apartment is fantastic and quaint, and having private access to the roof terrace was beyond amazing. We drank prosecco and watched the sunset every night we were there. Also, the location of this apartment is literally 20 meters from the Rialto bridge, which is great because at night there are still some supermarkets and bars/restaurants open, and there is activity happening in the area. It can get a little crazy with tourists during the day, but we just took some of Chiara's excellent recommendations and explored some local areas during the daytime. ALSO the vaporetto (water bus) stops right at Rialto, which is fantastic for ease of transportation.
Just note that this apartment is a 6th floor walk-up and there is no elevator, so be prepared to walk about 90-something stairs to the very top of the building. BUT that being said, the view from the top is SO WORTH IT!! :)