We visited Ludwigsburg last April.
We stayed in the Komfort Hotel, a business hotel near the train station. It had a decent breakfast and a nice staff. Rooms were pretty standard and just fine.
We enjoyed the Residenz Gardens quite a bit but did not go into the Residenz itself.
The town is pleasant and very walkable. Lots of cafes and restaurants. We had a couple nice meals at a small German menu restaurant (name?) on the north side of Mathildenstraße but I can not find it on the map. Maybe it is gone.
Ludwigsburg has good train connections to Stuttgart.