Cristina's place is really fantastic - it's really tidy and she's done a great job equipping it with everything you need. There I a supermarket just around the corner and loads of great places to eat that aren't in the main square where things are expensive!
The address you can put in Google is Calle Del Tintor, 1552, 30135 Venice which might help you find it - we found Google maps pretty easy to use so hopefully you will too!