We are going to trek for 5-7 days, area to be determined. Does anyone have recommendations as there are so many choices. Also looking for recommendations for hiking companies you have used?
Okay, take this with a grain of salt because I have not been there but there have been a number of people here who have raved about the Harz Mountains area for hiking. I'm sure others will chime in but I can tell you that the area lies in northern Germany and has a lot of hiking possibilities. Some of the towns in the region are Quedlinburg, Goslar and Thale - all charming and with many half-timbered houses.
https://www.nationalpark-harz.de/en/start/
https://visitworldheritage.com/en/eu/mystic-forests-of-the-harz-mountains/972d43d7-58a2-4ae5-9fa3-c6f63f3a2ec0
I've also included a couple of posts on this forum about the area, and I'm sure you can find more.
https://community.ricksteves.com/travel-forum/trip-reports/quedlinburg-and-the-harz
https://community.ricksteves.com/travel-forum/germany/quedlinburg-and-the-brocken
We hiked for a few days based out of Garmisch and had a great time. Not point to point though.