We have stayed a number of times in Duluth at other properties and this old school hotel is one of our favorites. It has character with unique room layouts. Independent of the room layout, the beds are very comfortable, prompting my wife to start looking for a replacement for our bed at home. The lobby is old dark wood and has old school finishes including an old vault door and friendly and helpful staff. The complimentary breakfast is served in a cozy room overlooking the lake and if you time it right you can catch the sunrise over the lake. Wi-Fi was adequate for my needs.
The hotel is attached to a complex containing Fitgers brew house (a conveniently short stumble back to your room at the end of the night) and a number of other shops and restaurant options. If you want even more options, you can pick up the outdoor lake walk behind the hotel which will take you to Canal Park. More of a summer thing, a car would be better in the winter.
There is no pool so that might be a disappointment if you have kids but on the good side you won't be having to compete for space with kids teams at the continental breakfast or in the hallways/elevators.