Great and cute room, nice bathroom, very clean and for a reasonable price comparing to other places in Venice (at least the price we had).
The view of this room is on a small street, you'll have the canal for the other ones.
The breakfast is quite nice and simple, common to what we find in Italy, fresh croissant, fruits, biscuits, good coffee.

For me, it is in the best area to stay in Venice. Castello is a bit away from the tourist crowd but it is also really pleasant to walk around and get lost, closed to great parks with Biennale and Arsenale expo places.