I've got a rental condo in Concord and have had some court action, as a landlord, regarding renters. Attention should be paid, whether there are lease agreements, and to the verbiage therein.
Some useful NH court info can be found at this NH Judicial site, for both landlord and tenant.
http://www.courts.state.nh.us/district/landlord.htm
References can be difficult to ascertain, especially when provided by the party interested in getting approval.