Leone made us feel welcomed when we arrived and gave us some great restaurant suggestions.
Leone's flat is centrally located in Venice and is only minutes away from St Mark's Square (Piazza San Marco) and the Rialto Bridge. The flat is updated to a modern feel and is tastefully decorated. Most importantly it was clean. While the space is small, it does not feel claustrophobic due to a good use of space and minimal use of furniture. The kitchen is equipped with nice glasses, mugs, silverware, and plates if you want to eat in or cook some pasta for yourself. He even provided some pasta, snacks, and water for us. :) The bed is a foldout couch, which again is ideal for the smaller space. It was very easy to open and close it. In terms of comfort it is about what you would expect for a foldout couch. The quality of the foldout bed is definitely on the higher end. The floors are heated in the flat, which was nice as we were visiting in February.
Note that you have to climb steep steps (about 1 floor worth) and that their is no accessibility options for those who cannot climb steps. This was not a problem for us but may be for others.
The only con I could think of is that we would occasionally get a sewage smell coming from the bathroom. It was easily remedied by opening the windows for a few minutes to let the flat air out. Most of the time we would keep the bathroom door closed with the window cracked opened which helped. Because it is an old building the ventilation for the sewage pipes is probably not the best. I didn't see this as a big problem as we had a way to quickly get rid of the smell.
I would easily recommend his place to anyone who is traveling to Venice with 1 or 2 people. Leone is a great host and his flat is clean and central.