To provide an accurate review I would need to review the apartment separately from the host.
1: The apartment was pretty great:
Well equipped, had comfortable beds, and was accurate to the photos in the posting. One big thing though, you should be aware that as a guest you have no control over the temperature in the loft space. If you need it adjusted you have to contact the host.
2. The hosting made the stay pretty un-great.
We felt completely—figuratively and literally—out in the cold and on our own.
Since you have no control over the temperature in the loft space, you are forced to contact the host (who is remote, in Paris, and can't really do anything to help you) or their friend who may or may not be available for help (in our case she was not available for help).
Also be aware that in the late fall and winter the Cannaregio neighborhood is prone to severe flooding. Plan accordingly and be prepared to walk through knee high waters on arrival or departure depending on time of day, tide levels, etc. This is something our host made no effort to warn or prepare us for, and left us entirely on our own to deal with upon on departure.
Honestly I was really disappointed with the hosting overall: total lack of communication leading up to our stay, directions provided to the apartment only two hours before arrival while I was en route on the train; extra fees for basics like sheets and towels; no control over temperature in a large and drafty space; curt and rude responses like "put on a sweater" or "your not in own home, so..." when we asked for temperature adjustments; and leaving us completely on our own at check out with flooding made our stay in Venice pretty unpleasant overall.
As a point of comparison, just prior to my stay in Venice, I had spent a week in NYC and a week in Florence, both using a home exchange service. In both instances (where no money was exchanged at all) I was greeted with the utmost hospitality, warmth, and kindness one would expect when traveling far away from home. The total lack of hospitality on Milena's part means the host is here solely to make money, and could really care less about their guests comfort, health, or well being.