It is difficult to give guidance here since one can not see the counterclaim in question.  Some times a "general denial" is best but that can work against you in landlord tenant court.  If the allegations are numbered (1, 2, etc.) then answer them in the same way.  And state that you deny each and every allegation in paragraph "1" of the counterclaim.  Your detail will be your defenses.  These can be put in as "affirmative defenses" in the response.  Clerks in L&T some times help pro se parties.  Go ask.  Good luck.