Maria's place is surprisingly easy to find given the maze of lanes in Venice. It is also extremely convenient being right opposite the railway station (across the canal) and also close to vaporetto stops. Also it'll be a 15min walk to the Rialto bridge.
The room was small but very clean and cozy. On the table is an electric kettle and a tray of chocolates, biscuits, rusks, nutella and teabags for your use which is delightful and not usually offered at B&Bs. Maria is a very sweet lady and speaks very little English but it is good enough for communication. Breakfast is wonderful with jam filled warm croissants, coffee, juice, youghurt and she brings it to the room. The private bathroom is also very clean. The room is cleaned everyday. There is wifi but you need to go over to Maria's own house next door or out in the alley (which is fine).
It is fantastic place to stay in Venice and will recommend this to everyone. Grazie Maria :)