I have been to the Casino Di Venezia a few times. If I am not mistaken it is the oldest running casino on earth, having been opened in 1638.
In general, I have been happy with my experiences there. You can take a boat directly to the front door, or you can walk into the back entrance. It is small, having two rooms for cards and roulette and a few depressing rooms for slots. The atmosphere is very classic and formal (despite the black-out-sad slot rooms), and when we have gone to play blackjack almost everyone was in formal attire. At times, it can feel like being in an Ian Fleming novel.
The downsides are also numerous, which stops me from giving the Venice Casino a five star review. First, there is an annoying card process which requires you to take a photo and pay an entry fee. Second, there never seemed to be complimentary drinks like there are at many other casinos. Third, the bar is deceivingly bad. Despite its cool atmosphere, the bartender didn't seem trained to really make cocktails. The drinks you can get are of bottom of the barrel, tourist trap bottom wrung club, quality. Fourth, like most other casinos, it isn't immune to attracting depressing gambling addicts who are wearing gigantic visors and mickey mouse tshirts from the 70s. This is especially annoying here, because it breaks the mysterious almost black tie atmosphere which otherwise exists.
Overall, I wish I could rate this five stars, but I can't. There are too many problems here for it to really create a perfect optimal experience. However, having said that, I will always spend a night here every time I return to Venice. I would recommend it highly, but with huge caveats. If it tried a little harder, the Venice Casino has an opportunity to create a truly epic experience.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.