I've downloaded a 3d model of a house and can't figure out how to correctly apply the particular textures for each room

I need help with a project I’m working on.

I’ve downloaded a 3d model of a house and can’t figure out how to correctly apply the particular textures for each room. When I create a material and assign it to the exact room, it is tiled throughout?

What am I doing wrong?

Any guidance would be appreciated, thanks.