As this way

The final plan is different

Thanks for your answer, architect Tikhonov, but there was a misunderstanding. Yes, I saw your floor plan, but the floor plan I posted in the first comment at my question (and now) contains a modification that I made, to explain where I would place the toilet and its opening. A little change to prevent that anyone sitting on sofa can see directly the toilet bowl. Italian idiosyncrasies :D

(I know in Russia there isn't a limit in this sense, but the Italian Building Law prohibits rooms with toilets without two filter doors towards kitchens and living rooms)