The Marriott is NICE and in a good location. The weather is a total crapshoot that time of year. The best advice is to be prepared to layer up.
Here are a couple of links that might be of interest. Have a great time!
http://www.citytourcard.com/english/...ting-page.html
http://www.usatoday.com/travel/desti...iversary_N.htm