Marco was always in contact with me and we were able to get into our room with one of his employees. Everything fine. The appartment is exactly how it's shown on the pictures. Pretty small but I liked it. Everything was clean and there was all we needed for four days.
There is a foldaway bed; if you have backproblems like me, it's not a comfortable bed, because it's too hard and has springs in it.
The room is very quiet, you don't hear anything from the streets, even though it is located very close from Rialto - perfect! We didn't have access to WiFi.
It's a little bit sad you can't see anything out of the room, because there are walls outside of the windows.
On the whole it's a good apartment to spend 2-3 days in Venice.