We stayed in Venice for 2 nights. We were promptly met by Leone at S. Stae vaporetto station (3 stops away from central railroad station). The apartment is 5 min walk from the station.
We saw the pictures of the apartment and read the reviews, but the pictures don't do justice to the apartment. It's so much better than the pictures.
The apartment was spotless clean. I usually notice even little imperfections, but I couldn't pick on anything much to the delight of my wife.
The kitchen was probably better equipped than our own. It had every single utensil you can probably think of. Every single plate, cup, pan, fork, spoon was sparkling. Margherita has an amazing collection of beautiful plates/cups.
There were fruits, snacks, water waiting for us when we arrived. Sugar/salt/vinegar/coffee/flour and lot more was provided.
There's more than enough closet space. The king bed was pretty comfortable, though a bit hard for my wife (I do like firmer mattresses).
The bathroom is equipped with washer (washing liquid is provided). We used it with no issues. The shower cabin is a bit small, but I believe it has a regular size not only for Venice, but for the most of the Italy.
We stayed there at the beginning of April and didn't need to use air conditioning or the heat. It was very comfortable as is.
The location is pretty convenient. 5 min walk from S. Stae station and about 20 min walk from central rail station. We actually didn't take a vaporetto except for the time we came to the rail-station and the time we took one to the airport and we walked quiet a lot. Pretty much everything in Venice is within walking distance. The streets look like a maze, so you'll be lost in no time without g00gle maps or an actual map.
Overall, it was a great experience and Margherita's place added a lot of value to it. If we're ever back in Venice, we're staying in the same place.