I stayed with my family at Federico's for 4 days and have only good things to say. The apartment is located on Calle De Le Vele street, which is 1 minute away from the Boat stop Ca D'Oro, 5 minutes walk to Rialto bridge and 10-12 minutes to Saint Marco Square. The house has several advantages: its air conditioned, big enough to accommodate 5 people, well equipped and clean. Right below the apartment there are several eating joints and cafes. Federico came to receive us at the Boat stop and made us feel very welcome in his apartment. He gave us a tourist book (from Lonely Planet), which helped us discover and find our way around in Venice.
I highly recommend the place to every traveler. Both the apartment and the host are good. Thank You so much, Federico for your hospitality and for letting us stay in your apartment.