Stairs lead to the future bedroom, just that i didn’t have the height drawing so in this first basic modelling, the ceiling is too much low.
I don’t know about the blocked? FPS, but since i activated autofocus for sure they dropped!
Sometimes a big camera blur occurs, that’s when you cross some geometry, i need to correct the player collision radius.
I’ve changed the camera speed/rotation to adapt to the room size, rotation is a little bit slow though.
The appartment entrance is opened for a beta tester friend, that seemed claustrophobic with the first closed version.
Now i established the “template” scene with the interactive things, i can go back to Blender and work the scene itself seriously 
Thanks for your feedbacks!