There is a reason Marco gets such wonderful reviews. He deserves them!
He is an individual of integrity, honor and graciousness. Extremely friendly and helpful and responsive to communications (within minutes usually)! He will indeed meet you at Ca'Rezzonico vaperetto stop, and he even helped us with our luggage. The apartment is beautiful and in a GREAT, quieter non-touristy area, though minutes by foot or vaperetto to St. Mark's, museums, Academia Bridge, basically all of the city. There are two bathrooms (one with shower, one with bathtub), and ample closet space. I slept in the second bedroom, which has a nice view of a quiet courtyard, has comfy beds, and a desk workspace. One thing which was great was the A/C of course and the fact that he has screens on the windows (which our airbnb neighbors did NOT have!) I feel obligated to note that my female traveling companion claimed there wasn't enough room for her stuff in the bathroom, but what would I know? I had plenty of room! Also I should mention that although there is a washer, there is no dryer. Usually hanging clothes to dry outside would pose no problem, unfortunately for us it rained most of the week. No worries, though, Marco provided an indoor drying rack so all worked out. I give Marco a superlative 5 star review. It was our first AirBnb experience and when (not if) I ever return to Venice I would want to stay there again. You won't be disappointed.