This is an amazing place, very close to the train station, that is a wonderful repose for the long walks a Venice. The fact that you have your own bath tub is a remarkable luck Sharee after walking the entire city! And the staff and the location is exemplary. I would certainly book here if you wish a quiet location near the train station.
If you want to go to Saint Marco Square, I’d recommend that you buy a water taxi day pass. You can also get to Murano (glass art) and Burano (lace art) islands very easily from here.