what kind of lighting tests have you done Futurerave?
your scene works as it should be, as you can see from the image attached no particular issue were found:
I simply rotate all the lights to facing inside the room, enabled the option “use inverse square”, gave them a proper value and color (following my tastes)…that’s it
used the post-process volume to strength a bit the contrast, push more the AO and desaturate
…don’t know why the kitchen floor gave me problems when baking the light (I had no time to spent for it so I deleted 
).
