Me and my two friends enjoyed staying at Saifs place. The room, the privat bathroom and the shared kitchen were clean and we even had access to the balcony.
The airbnb rents out different rooms, so you are not the only guests staying there. But you still have your privacy.
The appartment is only 3 minutes away from the central station so you get to the heart of Venice easily.
I highly recoomend Safis Apartment!