I was part of the planning committee for a conference that was held at the Concourse. Everything about this place was wonderful! First off, the location is great -- just a few steps away from the Capitol and close to State Street and lots of great places to eat! Second, the venue itself is gorgeous from the lobby to the guest rooms; very clean and updated. The conference rooms were also fine and they are able to configure the rooms (including the ballroom) for events of various sizes.
The thing that really stood out here was the incredible service. Every staff member I interacted with was extremely friendly and helpful (during both the conference planning and the event itself) and answered any questions we had and really went above and beyond in terms of service.
If you're looking for a venue to host a large event, or just looking for a hotel to stay where you can really experience Madison, I would recommend looking into the Concourse!