As I mentioned, the kick-off meeting is in Lian, and you have all the transportation information in earlier post (“kick-off meeting”).
Any hotel in the vacinity of St. Olavs gate is good.
Here is a list of hotels that can be relevant for you;
Thon Hotel Prinsen
Quality Hotel Augustin
Thon Hotel Trondheim
Comfort Hotel Park, Trondheim
Hotels that requires 10-15 minutes walk to the Tram station:
Thon Hotel Nidaros
Comfort Hotel Trondheim
Clarion Collection Hotel Grand Olav
Prices are around 100 euro a night.