I would have loved to have given a higher rating for this hotel, because my initial impression was very positive. However, a couple things tipped the scales at the end.
Value: This hotel is very conveniently located and easy to find as far as Venice goes. You check in at the Hotel Rialto front desk which is right beside the Rialto bridge. We chose this hotel for the location and relative price in this very touristy area. However, once we arrived, we realized that nothing is far away in Venice. To reach better quality and better priced restaurants and to avoid the crowds, we would walk 5-10 minutes away from the hotel anyway. So in hindsight, we could have gotten a nicer hotel in the type of neighborhood where we actually ended up spending our time. Breakfast here was also not included, but you could get it for 20 euros each. While convenient, you can get a coffee and pastry at most caffes in Venice for under 10 euros (usually only 10 euros for two). I found the quality and selection at the hotel breakfast also sub-par.
Cleanliness: One big thing was wrong here, the bottles and cans in the mini bar clearly aren't changed regularly, because there was mold on them... We weren't planning on eating or drinking anything anyway, but this really should never happen. It brought into question everything else.
Overall, very prompt and friendly staff, centrally located, and reasonably equipped room. But you will find better value outside of the St. Marks district for a lower cost.