Thank you to all for the comments.
All those questions - that will be a challenge for my English
Elsa, this building is around 50 meters from a road with streetlights, with some trees between. When using long exposures the shadows from the trees can be seen on the red wall.
Gary, it is an old large boathouse, the person who built it was a fisherman, this is where he kept all the stuff needed for his work. The current owners use it primarly as an exhibition house for old and antique things, and they sometimes arrange parties for friends inside there. In 2011 there was an extremely high tide in this area, that's why it was flooded. Such a high water level has never been seen here before. In #2 it looks like part of the walkway is missing because the starting point of the walkway is flooded.
The temperature in the winter here is usually somewhere between minus 3 and 12 C, coldest when the sky is clear. I think the coldest we have had here is around minus 20 degrees Celsius.