I used to live in Munich - anywhere in the Altstadt would be amazing. Many hotels around Hbf are also good - we've stayed at the Sofitel. Areas in Schwabing./Maxvorstadt are also convenient - and probably any decently rated hotels within the first few rings will be great.
If you're interested in a hotel outside of the super touristy area and convenient to the train station (i.e., paris to munich), I liked le robinet d'or - near canal st. martin. Disclaimer - I've been to Paris a few times so I intentionally wanted to be outside the main tourist zone.