Rail works best when the whole day stays simple
Leuven and Mechelen are natural rail choices because the station, centre, and evening can form one compact trip. The convenience still depends on the current train and the time you need to return.
Dinant is also served by rail, but the journey and return margin deserve more attention. Check the live plan rather than treating one typical journey time as a permanent promise.
A car helps only when it serves a focused plan
In the Ardennes, a car can solve the final transfer and connect a valley, castle, walk, or small town that public transport does not combine cleanly. It does not make an overloaded list relaxing.
Choose one main area and use the car to deepen it. Long cross-region days, parking, winter conditions, and an evening drive can remove the very slowness that made the Ardennes appealing.
The best base protects the evening and next morning
A good base makes dinner, the first activity, and the journey home straightforward. A room that looks central on a national map may still sit in the wrong valley or require repeated transfers.
Choose the destination first, then the neighbourhood or valley, and only then compare accommodation. This order keeps price and availability from deciding the geography by accident.