You can't really trade off square footage vs commute length linearly because there is no objective criterion.
What you can do is prove that Apartment A has fewer square feet than Apartment B and a longer commute so A is dominated by B.
Out of your complete set of apartments you can that there is a small set that dominate all the others. When you are down to that you can make your personal choice from that set.
So why it's not possible like that to give score to each apartment? I mean if I find right weight for each parameter? How f.e. google rates websites, I guess it gives some kind of score to each of them? Or not?
For instance, I live in a 2000 sq ft. space, I will have to store things if I move into a 1500 sq ft. space, and have to sell them or throw them out if I move to a 500 sq ft. space.
A 3000 sq ft space would feel spacious to me but I would not get 10x the utility if I had a 30,000 sq ft space because I don't have enough stuff to fill it.