I have had research done with good results from
Karl-Heinz Steinbruch. You can e-mail him with questions and see if he knows of any city guides. If you want to research church records and emigration petitions he can do that.

Mecklenburgica
Archiv- und Recherchedienst - Archive- and Research Service
Karl-Heinz Steinbruch
Postfach 110841 - 19008 Schwerin
Telefon/Fax: 0049-(0)385-3923875
E-Mail: Mecklenburgica.Steinbruch@t-online.de
www.MeinAngebot.de