I think it is important to choose a good place for a camp first.
I would search in the hiking map for a good place, if possible with wellspring for drinking water, a medow to camp on in a corner of two hedges and a wood in approximately 100 m distance for gathering fire wood. Wind protection, no old trees above the tent.
If it looks good in the map I would go there and if I am convinced that it is worth the effort, I would take photos of the corner, well and forest and go into the next village and ask the farmers who owns it. And then ask the owner for permission, personally.
Would we get an e-mai from a guy in Berlin we probably would say no.
If he stands around tea time in front of the gate, asks courteously and looks good, we probably would say yes.
I recommend to avoid camouflage clothing as well as bright colours. And I would rather speak about silence and bird watching and a small tent in a corner than about wood-shelters, bushcraft and survival.
I would ask for fire permission later in Autumn, not in the beginning. If I know the guy and trust him, he can ignite a little fire on our ground to make a tea, why not?
If one comes along and asks if he may dig a WW1 trench here and burn down our forest we tend to call the police...
But a guy who wants to watch birds and other wild animals next to the forest and also stay over night? If he looks for silence he probably will be relatively quiet.
Why not? We can try it with him.