The building was a guesthouse or something, with some 35 rooms. The room was almost empty, except the kitchen that had a few dishes (so it was far from "fully equipped" as mentioned in the description). The staff are saying that the price is too low for more equipment. The building was quite old, so we had some problems with shower and the window: in the shower the water was not drained properly, and the rain was leaking from the roof near the window (as the staff said, "the reason for the leaking [was] the wind", so perhaps not the building or the window). In the bathroom, the toilet was so close to the shower that you couldn't sit on it properly.
The good things about the flat was that it had a TV (as a surprise, the TV was almost modern and could read the H265-encoded movie I had on my USB stick). There was a supermarket nearby (Simply Market), with a bus stop in front that you could use to get to Venice. The train station was also not so far, and you could walk there in half an hour (and get to Venice from there by train in less than 10 minutes for 1.25 €).
If you just expect a place to sleep, and want to spend most of your time in Venice, then this place is not so terrible.