The last weekend in april starts 5 days from now, yes???
this is a very pretty hotel with nice rooms. they have rooms now. i have never stayed there. it is behind the danieli, where i have stayed.
https://www.hotelalleon.com/
i have stayed here. we really like the place. we did stay in the jr suite, which is on the grand canal, but the whole place is very nice, and has a great location. my sister stayed there, and thought it also great.
http://www.caangeli.it/eng/caangeli.html
they have a few rooms at the moment.