I didn't have any problems during my stay at Fraivolti. Some might find it really small and be prepared to climb too many high steps to reach the room especially if you carry heavy baggages. However on my part the place met all our expectations and the room was perfectly clean.
Marco was very responsive to any question I had and had all details ready for us a few days in advance.
Would love to return here someday. It was perfect and close to all the Rialto Bridge and a few minutes away from a vapoertto stop.