For once, the ad is accurate. It is a charming place, sort of a doll house, on ground level, really neat and quiet. It has been renovated with care and taste and everything is very handy. It fits for four people perfectly.
It is an alley near Campo Santa Margherita, a very picturesque square with lots of cafes and restaurants.There is a supermarket next door so if you feel like cooking your own pasta, it is also an option.
A great base to discover Venice close to Ca'Rezonnico and Academia boat stops. The city is yours!