If you like to have all your stuff near to you and you make a reservation in the upper deck, it is a good idea to take the seat at the window. There you have a place to store your hand luggage beside your seat. You don’t need to open the overhead compartment and push up a weighted trolley. It can be handy if you’re a woman!
I had twice seat K86, perfect! Near the window and in the middle of the second part.
I travelled with Lufthansa in business class, it was a night flight. They gave me a pyjama to sleep when I went to my destination, when I came back, it looks not necessary anymore… Strange on that as some people got one. The crew was not so friendly, but OK, I don’t speak German.
There is a huge difference in crews. Sometimes they are really nice, another time….