Another to look at might be the Hotel Ala. They are at a vap stop, have AC, and elevators. We've been there twice.

hotelala.it

Hotel al Ponte Mocenigo is my favorite hotel. Love Walter and Sandro. I've stayed there at least four times.

It's a very short easy walk from the San Stae vap stop.

http://www.alpontemocenigo.com

The trip was scheduled for several months ago. It was resurrected by a spammer.