The apartment was clean and provides a lot of amenities (even provides detergent for the washer). Bed was comfortable and it was really nice to have a living room. Location was convenient- 15 min walk from the train station, 10 min walk from bus station, 25 min walk to San Marco Square and Rialto Bridge. The apartment is on the bottom floor so be prepared to hear foot traffic every now and then.
Communication with the host started poorly. I sent 3 messages within 7 days, 2 weeks prior to my arrival with no response. Giovanna (Mario's wife) finally responded 4 days prior to my arrival but didn't give me the address to the apartment until the morning I was traveling to Venice. Once we got to the apartment, the check in went smoothly and she provided us with a map of the city and recommendations on close grocery stores and restaurants. I even asked her for help to get a reservation at one of the restaurants she recommended.
Overall we enjoyed our short 2.5 day stay. Good/safe location.