Thanks for your advice heartlessphil
no,all the UV are made by me (except for the “library” objects for which I made only the 2nd UV channel by a flatten UWV Unwrap with a value of 2 of padding).
Here is the last update (seems good emprovement), those are the adjustments adopted:
- as you suggested, for the reflections I have bosted up the settings into the postprocess volume…good results but there is still a strange behaviour in the reflection (only when I am lot near the surface)
- I changed the two outer front lights from “static” to “stationary” and enabled the “Used RayTraced distance field shadows”, it changes completely the mood (better shadows and light propagation)
- change the orientation of the directional light and set to “0” the “indirect light intensity” for avoiding the strong color bleeding due to the high saturated color of the bed.
still the trouble of lack of contact shadows fot the chairs and the bed legs…don’t know how to solve it 
…strange behaviour occurred when I switched from static to stationary, before, no highlights were visible, now they are visible (…two white splotches on the mirror and on the bed wall. They don’t look too good on the mirror and I know that with the “min roughness” parameter they can be spreaded away…but I don’t want to erase them from the bed wall too).
If there is the need I can send you the scene heartlessphil, now the only issue is the contact shadow, after that just tweaking materials and settings for trying to make it realistic :rolleyes: