If you're looking for a peaceful place, inhabited by real Venetian and off the town center agitation, you'll probably love Mood Petite!
Moreover, we had a really warm welcoming from Valeria who took us from the train station to the accommodation, and helped us choosing the right transport tickets, so thank her if she somehow read this! :)
Mood Petite is like 10min from San Marco, but it feels like you're miles away! The flat is really clean and brand new. You have all you need inside, a little shop at 5min on feet to fill up the fridge.
If someday we come back to Venice, we'll contact Manuela for sure! :)