Carlo's location is great! Excellent to walk a few bridges to everything you want. About 20 minute walk to San Marco and even less to public transportation to the airport. The rooms are clean and suited us for a three night stay.
However, the expected additional cost of 20 Euro's to meet his representative to find the home and get the keys was a major buzz-kill. Obviously you need to know where the house is and get keys, but asking for a "small tip" of 20 Euro’s is outrageous. I’d rather it built into the cost, we still would have stayed there. The additional penalties for trash etc are also a bit more than I’ve seen ever elsewhere.
There are some books and maps there that might help, but traveling in Venice is very challenging. The location and overall stay was great and well worth your time and vacation there. Venice is beautiful.