Dear Harald, thank you for being lovely guests once again and your positive review.
I am really sorry that your son did not enjoy his sleep because the spot of the bed was not to his taste. Some people love to sleep next to a window and others hate it. I am surprised you did not tell me. And I recall I left extra sheet in case you wanted to open the sofa bed. You could have easily done that. The sofa bed is of double size, suited comfortably and does not get affected from the air coming through the window. Well, may be next time if you decide to stop over ;)