1. they should take in to account the amount fo space in th elving an dth elayout of the room eg. where the windows, door radiator etc.
2. they should take into account the size of the furniture for the room, is it too big, too small
3. they should take into account the lighting, is there natural lighting if so where, where is there artifical lighting if not where will they put some if any.
4. they should take into account will there be any storag ein thge room( i would suggest they put some in) where will they putting said storage will in be in a closet, baskets in cupboards etc.