This was mine and my girlfriend first experience with AirBnb, and we loved it!
Leonardo & Irene were really accurate and informative during communications, they made us feel really comfortable at their place and they made checking in and out very straight forward.
The house was clean, cosy, and it had everything that one might need (i.e. toilet, kitchen, heating system, extra blankets for cold nights, a collection of tourist information leaflets).
The location was really nice as well. At walking distance from all main places in Venice, quiet but near restaurants, supermarkets and shops, and right in front of one of the main ferry stations (which in Venice replace the more traditional busses).
Overall, 5/5 in every aspect