I am obsessed with these boots!
I am usually a size 41 but I bought a 42 and they fit perfectly. There is still some extra room but the additional inserts that come with the boots were handy to downsize 0.5 of a size.
Have worn them out all night and day twice now and they don't hurt or cause blisters anywhere at all - the square toe is a great attribute to this.
The only slight issue is they are a little tight on the calf (mine is 40 cm) and was a little tough to zip up but I got there and the elastic is helpful too (also aware they will stretch with wear).