Some gamedev advice:
The mesh edges are visible on the wall with the window for some reason.
Look up texel density for more cohesive graphics.
You're fucking with something in a wrong way whenever a player interacts with the fireplace(perhaps particles), that causes stutters for several seconds. It is a weak/old rig but for those simple graphics it feels weird. I can play half life 2 or bioshock.
Instead of having a no-ambience zone inside the house and then max volume ambience, perhaps use a radius around the center of the house and ease the ambience volume gradually.