There are a lot of considerations to make when buying a TV. Chief among them are what size and viewing distance you need. This handy tool takes the guesswork out of both of them.
To simplify a bit of complex science, the bigger your TV is (without changing the resolution), the less crisp it looks. And the farther away you need to sit before you can't tell the difference anyway. This handy tool from ForRent.com shows you the best viewing distance for 720p, 1080p and 4K
There's still a bit of guesswork to be done based on the size of your apartment, but if you're looking at a few different TV models, you can use this to see how far away you'll need to sit in order to get the most out of it. If a particular size requires more space than you have, you can safely get a smaller (and likely cheaper) size without a loss in perceived quality.
What TV is Best For My Apartment? [For Rent]