<p>I propose:</p>
<p>The apt. has 4 rooms: bedroom 1, bedroom 2, living room, and kitchen. Each room is worth 2 units. Each of the “sleeping area” is worth 1 unit for the total of 5 and the common area (kitchen + 1/2 living room) is worth 3 units. There are totally 8 units.</p>
<p>The person taking her own bedroom pays 2 3/4 units (2 sleeping areas and 3/4 for the common area), each of the other three pays 1 3/4 units.</p>
<p>It works out to be 891 + 568 + 568 + 568.</p>
<p>If the living room becomes a bedroom, meaning the person taking the living room has it all for him/herself and noone else can use the living room, then the common area (kitchen) is worth 2 units, shared by everyone. The split is now 2 1/2 + 2 1/2 + 1 1/2 + 1 1/2, or 811 + 811 + 487 + 487.</p>