I think you have some scaling issues to address here. Some of the rooms, the kitchen and bathroom in particular, seem very large. Or the appliances in them are very small. One of the two. 
I think correcting the scale would give the rooms a more believable feeling and work better as a game environment.
Just my 2 cents…
EDIT : You may also want to add some polygons into a few of those props. The toilet and sink jump out at me the most. I can see the silhouettes and it makes them look low poly.