Could you please recommend affordable hotels? Will be there on May 13-15. Thanks.
You will have better luck with getting answers to this in another section of the helpline: To The Boot
http://www.ricksteves.com/graffiti/helpline/index.cfm/rurl/wall/to-the-boot/index.html
You mean tomorrow? I'd get to the TI office in the train station as soon as you can. Alternatively, see if the Hotel Santa Lucia still has room. It's quiet and clean and near the train station. Some rooms share a bath on the hall and are about as inexpensive as you'll find in Venice.