u/False_Importance941

I am planning to travel to Munich and vicinities. I have a friend who will show me around and I would be staying with them throughout my visit. I have the invitation letter stating I will be their guest while I’m there. Would I need to submit other stuffs such as planned activities? I will be taking care of the financial aspects on my own will be submitting the necessary documents. What I’m concerned about is that chances of visa approval going down without hotel bookings and details of the trip.