Fitger's is the only place I stay when traveling to Duluth on business.
The beds and linens are extraordinary. The views (if you request a lakefront room) are fabulous of Lake Superior, and even the room service is far above average.
All of the rooms are beautifully furnished and contain cordless phones and CD players. Instead of a card key, the rooms actually use real metal keys - a charming throwback. Did I mention the price is totally reasonable? You can also enjoy dinner at Bennet's downstairs. While not the finest cuisine, it is still good and the views of passing ships make it that much more special. Bennet's also serves outstanding breakfasts.
In short, stay at Fitger's - - you won't be disappointed.