Marco's apartment is charming with a lot of character. It's location gave us the essence of Venice. Although it was not very close to an accessible Vaporetto stop (actually, the San Angelo stop is just opposite but you'd have to swim there across the Grand Canal get to it as there are no bridges nearby), it was about 5 minutes walk to 2 stops on either side - not a problem unless you have luggage! It is also about a leisurely 7-8 minute walk to the Grand Canal and Rialto Bridge. And there are lots of interesting eateries around it. We just walked everywhere.
Located on the Rio San Polo meant it was very easy to get on a Water Taxi to or from the airport or Cruise Terminal (albeit a rather expensive mode of transport).
Having 2 full bathrooms & 3 bedrooms (we only used 2) was great for our family. It is excellent for around 4 persons. The apartment had almost everything you'd need (there's WiFi available now, but curiosly, no kettle, microwave or toaster)
Although we never met Marco, his local agent, Guilia, was excellent. She was responsive & very helpful.