I stayed in the Hotel Ala (maybe it was Alla) nearly twenty years ago on my honeymoon, it was (and probably still is) a friendly, comfortable, clean 3*** type hotel, overlooking a small square where the first sound we heard every morning was a harpist playing under our window in the square below. Otherwise quiet as I remember. It was about 3 minute walk from St Mark Square and even less to the nearest waterbus station. I'd have recommended it then but obviously don't know what it's like now.

If there's a 'Rough Guide to Venice' produced have a read of that for hotels, they're usually pretty good at telling it as it is.